 # Common difference arithmetic sequence calculator          common difference arithmetic sequence calculator It will turn green when correct. The difference between each number in an arithmetic sequence or the difference between any two consecutive term. The common difference is typically represented by the variable “ d. How I Teach Arithmetic Sequences Part 1 Arithmetic Sequences Algebra Interactive Notebooks Math An arithmetic sequence is a series of numbers where the difference between neighboring numbers is constant. We also call an arithmetic sequence as an arithmetic progression. Note: exam questions frequently involve this second formula. Finding the arithmetic sequence and its sum example: finding the term and sum of arithmetic sequence for 15th number of terms if the first term is 5 and difference is 4. is an arithmetic progression with a common difference of 2. 5th term is Aug 05, 2021 · Common Difference . ” In this sequence, the common difference is +3. 2. Choosing any two pairs of numbers from the sequence and subtracting them gives d . The nth term is an unknown term in an arithmetic sequence. High School Math Solutions – Algebra Calculator, Sequences. The constant is called the common difference ($d$). This constant is called the common difference . Free Arithmetic Sequences calculator - Find indices, sums and common difference step-by-step This website uses cookies to ensure you get the best experience. We learn how to find and use the formula for the n-th term of an arithmetic sequence and learn how to solve several must-know exam questions. 4. This constant difference is called common difference. If the common difference is: Positive, the members (terms) will grow towards positive infinity. Transcribed image text: Find the first term and the common difference of the arithmetic sequence described Give a recursive formula for the sequence Find a formula for the nth term. This online calculator computes the last nth term of arithmetic progression and the sum of the members. Providing the nominos border to each other, this sum works Calculate the common difference for each hour. is an arithmetic sequence because the common difference between each term is 5. = -10 + 1062 {multiplied 59 by 18} . A. . This common difference gives the times table used in the sequence and the first part of the position-to-term rule. Common difference (f) the n th number to obtain . Arithmetic progression sequence is a sequence of numbers such that the difference of any two successive members of the sequence is a constant. 5, The number of terms in the AP is 10 and Website is developed by Softo media; To provide all necessary tools that can help people to manage their work. In The common difference is used to extend the sequence. This calculator uses the following formula to calculate the mean: Arithmetic progression is the sequence of numbers in which the difference of two consecutive numbers is a constant. There Are Two Ways To Write A Rule For The Terms In An Arithmetic Sequence Explicitly And Recursively This Site Arithmetic Sequences Arithmetic Learning Math. Mar 26, 2021 · An arithmetic sequence is a sequence of numbers with a common difference. d 1 = a 2 − a 1 = 2 − 1 = 1 Similarly d 2 = a 3 − a 2 = 4 − 2 = 2 d 3 = a 4 − a 3 = 8 − 4 = 4 d 4 = a 5 − a 4 = 16 − 8 = 8 From above calculte Aug 12, 2021 · How To Calculate The Common Difference Of An Arithmetic Sequence. First term : …. Arithmetic sequence also has a relationship with arithmetic mean and significant figures, use arithmetic mean calculator & significant figures calculator to learn more about their calculations. an = d (n - 1) + a1. a_2-a_1=-22--32=10. What is the arithmetic mean. org Nov 12, 2020 · Expert Answers ( 1 ) 2020-11-13. . This formula is; Nth term = a1 + (n-1)d. If you want to see how this recursive sequence calculator calculates the arithmetic sequence, read this complete post. As: data the three terms and the last term of a finite arithmetic sequence, find the total number of terms. Calculator of Arithmetic progression Oct 27, 2021 · An arithmetic sequence or progression is defined as a sequence of numbers in which for every pair of consecutive terms, we get the second number by adding a fixed number to the first one. The procedure to use the arithmetic sequence calculator is as follows: Step 1: Enter the first term, common difference, and the number of terms in the respective input field. Examples of Arithmetic Sequence: In contrast, an arithmetic sequence with a common difference of "is: 2, Âº1 ã, â €, â € 10. Arithmetic Sequence Calculator is an online tool that helps to compute the first five terms of an arithmetic progression when the first term and the common difference are known. Question 2: Consider that the first term of an AP is 5. The common difference calculator takes the input values of sequence and difference and shows you the actual results. Contributed by: Sarah Lichtblau (March 2011) In an arithmetic progression the difference between one number and the next is always the same. Write the first 5 terms of the arithmetic sequence given its first term and common difference. - Find the nth term and the sum of the first n terms of an arithmetic sequence by providing a value for the initial term, common difference, and the index of the term that you want to find. com's Arithmetic Progression Calculator is an online basic math function tool to calculate the sum of any number series that follows a common difference between the consecutive terms. Just copy and paste the below code to your webpage where you want to display this calculator. Solution : To find the 1 st term of the sequence, we have to apply n = 1. You can use it to find any property of the sequence - the first term, common difference, n?ʰ term, or the sum of the first n terms. Free Arithmetic Sequences calculator - Find indices, sums and common difference step-by-step. For instance, the sequence 5, 7, 9, 11, 13, 15, . Enjoy! arithmetic. Arithmetic progression is a sequence, such as the positive odd integers 1, 3, 5, 7, . The number d is called the common difference because any two consecutive terms of an arithmetic sequence This program will generate an arithmetic sequence, the nth term in the sequence and the sum of the sequence. 25. For example, the third term is t 3, the eighth term is t 8 etc. Where a 1 is the first term, and d is the common difference. If the initial term ($$a_0$$) of the sequence is $$a$$ and the common difference is $$d\text{,}$$ then we have, Arithmetic Sequences 3 - Cool Math has free online cool math lessons, cool math games and fun math activities. Nth term and the sum of the series formulas: There is a formula used to find the value of any place in a sequence. Examples of arithmetic sequence: Arithmetic Sequence: An arithmetic sequence is a sequence in which each term is found by adding a common constant to the term preceding it. Download Wolfram Player. 8, Ã¢ | Find the whole 50 Â° positive odd. zip: 1k: 00-04-09: Arithmetic Sequence/Series v1 Solves for these 5 variables (you have to input 3 out of 5): A1, An, D, N, Sn. This Demonstration allows you to practice finding the common difference or the next term in an arithmetic sequence. 3. Common Difference is the difference between the successive term and its preceding term. The common difference is the difference between any two consecutive numbers in the sequence and is denoted by ‘d’. By applying this calculator to arithmetic and geometric sequences, the n-th term and the sum of the first n terms in a sequence can be obtained accurately obtained. Arithmetic mean formula. Hence, the nth term would be 14 and the sum of Identify the Sequence 8 , 6 , 4 , 2. 5, 10. There are many problems we can solve if we keep in mind that the n th term of an arithmetic sequence can be written in the following way: a n = a 1 + (n - 1)d. For example, the sequence 2, 7, 12, 17, 22, 27,. 1 4 7 10 13… is an example of an arithmetic progression that starts with 1 and increases by 3 for each position in the sequence. $$d = 10. Arithmetic sequence calculator is the quick online tool which is useful in finding the ‘n’th term in the sequence or the sum An arithmetic sequence is a sequence where the difference d between successive terms is constant. n Jul 10, 2020 · In an arithmetic sequence, the difference (an addition or subtraction) between any two consecutive terms is a constant. We now turn to the question of finding closed formulas for particular types of sequences. The behavior of the arithmetic progression depends on the common difference . The mean, most commonly known as the average of a set of numerical values, is a measure of central tendency, a value that estimates the center of a set of numbers. The first term of the P is denoted as ‘a’ and the number of terms is denoted as ‘n’. If a1? is the first term of an arithmetic sequence and d is the common difference , the sequence will be: {an}={a1,a1+d,a1+2d,a1+3d,…} The arithmetic sequence is a sequence of numbers with following pattern: a 0 + n * d; Where: a 0: First term d: the difference, step n: Terms For Example: 3,7,11,15,19,23,27 is a Arithmetic Sequence with step 4 Simple Sequence Calculator. The number in front of the n in the arithmetic sequence formula tells us what the difference is between each term in the sequence. nth term of arithmetic sequence. 1 - Enter the first term A1 in the sequence, the common difference d and n the number of terms in the sum then press enter. definition: a n = a 1 + f × (n-1) Some Common Sequences. 4 Arithmetic sequences: An arithmetic sequence is a sequence in which the difference between each consecutive term is constant. And if you know the first number in the sequence and the common difference, then our number sequence calculator will give you the value of any given number in the sequence as well as the sum of the sequence until that particular number. If is the first term of an arithmetic sequence and is the common difference, the sequence will be: Finding Common Differences. If you take every number in the sequence and divide it by the previous one, and the answer is either the constant or the same, the sequence is an arithmetic sequence. One can find the nth term of an arithmetic sequence with \ (a_n=a_1+d (n-1)$$. 5, the number of terms in the AP is 10 and the sum of the AP is 100. u 1 + ( n − 1) d) Where u 1 is the first term of the sequence and d is its common difference . May 11, 2021 · The common difference, algebra video explains the general term of arithmetic sequence calculator find arithmetic and parents are someone who prefers to have made. Definition Online calculator to calculate the sum of the first n terms and the nth term of an arithmetic sequence . \ (n\) represents the desired This arithmetic sequence calculator calculates the N-TH term and the sum of the first n terms of an arithmetic sequence, given the first mandate of the sequence and the common difference. To clear the calculator and enter new data, press "Reset". 6, 13. If the values of a₁, n, and d are correct, then the formula should calculate the last term to be $5. For example: 1, 3, 5, 7, 9, …. Find a formula for its general term. 7, 16. 5. The fixed number that must be added to any term of an AP to get the next term is known as the common difference of the arithmetic progression. The common difference is the value that is added or subtracted from each term in an arithmetic sequence in order to generate consecutive terms. Examples: For the sequence. , in which each term after the first is formed by adding a constant to the preceding term. It is also known as the arithmetic series calculator. This constant is called a common difference. These calculators will be useful for everyone and save time with the complex procedure involved to obtain the calculation results. The number d is called the common difference because any two consecutive terms of an arithmetic sequence differ by d, and it is found by subtracting any pair Arithmetic Sequence Calculator. To calculate an arithmetic sequence then, we require the first term, which we call a, and the difference (d); which is constant between terms in the case of an arithmetic sequence. Their properties of a calculator to avoid charges for anarithmetic sequence, an arithmetic series get through calculus and general term! Step by step guide to solve Arithmetic Sequences problems. 8 8 , 6 6 , 4 4 , 2 2. 8\) Arithmetic sequences calculator. Solution: A_1 = 2, r = 4, n = 10 The May 16, 2020 · An arithmetic sequence is a sequence of numbers such that the difference of consecutive terms is constant. You can calculate the last term (the cost of parking for 6 hours) using the formula. Do not show again. An arithmetic sequence is a specific kind of series, where the difference between the numbers is constant. Sep 09, 2020 · The common difference calculator takes the input values of sequence and difference and shows you the actual results. It is known that, a sequence is arithmetic when the differences between consecutive terms are the same. Arithmetic Sequence. For example: If n is 5, a1 is 2 and d is 3, then the sequence would be, 2+5+8+11+14. 4, 7. Click "New Sequence" to get a new sequence. Arithmetic progression is a sequence, such as the positive even integers 2, 4, 6, 8,10, 12, . 2021 © softo. Calculate the difference between a 2 a n d a 1. This is an arithmetic sequence since there is a common difference between each term. Arithmetic Sequence Definition. An arithmetic progression (AP) or arithmetic sequence is a sequence of numbers such that the difference between the consecutive terms is constant and is calling common difference. Arithmetic Sequences. Arithmetic Sequence Calculator This arithmetic sequence calculator can help you find a specific number within an arithmetic progression and all the other figures if you specify the first number, common difference (step) and which number/order to obtain. We add 2 from one term to the next and so, the common difference is 2. an = a + (n – 1)d. Apr 24, 2020 · An arithmetic sequence is a sequence that has the property that the difference between any two consecutive terms is a constant. When dealing with simpler sequences, we can look at the sequence and get a feel for what the next term or the rule Arithmetic sequence is a sequence where the terms in the sequence follow by a common difference. Here's a brief description of them: Initial term — First term of the sequence. Negative, the members (terms) will grow Given an arithmetic sequence, we can calculate the sum of its first n terms, S n, using the formula : S n = n 2 ( 2. Type the common difference into the input box. In other words, an = a1 +d(n−1) a n = a 1 + d ( n - 1). Arithmetic progression calculator work with steps shows the complete step-by-step calculation for finding the n^{th} term and the n^{th} partial sum of an arithmetic progression such that there is 5 terms in the arithmetic progression, the first term is 5, and the common difference is 4. The nth term of an arithmetic sequence is given by . A tool perform calculations on the concepts and applications for Arithmetic Progression calculations. Choosing any two pairs of sequence numbers and subtracts them there d. This sequence can be described using the linear formula a n = 3n − 2. The general term of an arithmetic sequence can be written in terms of its first term a1, common difference d, and index n as follows: an = a1 + (n − 1)d. The arithmetic sequence formula in mathematics, an arithmetic sequence or arithmetic progression is a sequence of numbers in such that the difference between Question 1 : Find the first term and common difference of the arithmetic sequences whose n th terms are given below (i) t n = -3 +2n. Providing the numbers border each other, this sum works regardless of which pair of numbers are chosen. find value of h+k. An arithmetic sequence can be defined by an explicit formula. Given the arithmetic sequence, find a formula for the general term and use it to determine the 100 Â° term. For example, the sequence $$6, 8, 10, 12, 14$$, … is an arithmetic sequence with common difference of $$2$$. a_3-a_2=-12--22=10. A series is the sum of the terms in a sequence. Watch this one minute video for a quick example of how to find the common difference: d d d - the common difference of arithmetic sequence. Geometric Sequences: A sequence in which every term is obtained by multiplying or dividing a definite number with the preceding number is known as a geometric sequence. For example, the calculator can find the common difference () if and . Arithmetic sequence. What is an Arithmetic Sequence ? Answer : An arithmetic sequence is a sequence of numbers in which two consecutive terms always have the same difference. Jul 01, 2021 · For example, the sequence of 3, 5, 7, 9, 11… is arithmetic because the difference between each term is 2. \ (a_1\) represents the value of the first term of the sequence. Aug 25, 2021 · Hence, the common difference of the given series is 5. 5, The number of terms in the AP is 10 and This arithmetic sequence calculator (also called the arithmetic series calculator) is a handy tool for analyzing a sequence of numbers that is created by adding a constant value each time. Example: Consider the sequence {1, 5, 9, 13, 17, 21, …} is made by adding 4 each time, therefore it has a “common difference” of 4 (there is a difference of 4 between each number). The biggest advantage of this calculator is that it will generate the first three terms of an arithmetic progression are h,8 and k. The difference between neighboring terms is a constant value of 2. Arithmetic Sequences: A sequence in which every term is obtained by adding or subtraction a definite number to the preceding number is an arithmetic sequence. #arithmetic #progression arithmetic progression arithmetic sequence arithmetic series Engineering Math progression PLANETCALC, Arithmetic sequence calculator and problems solver Timur 2021-01-30 14:33:53 This common value is called the common difference (d) of the Arithmetic Sequence. Really clear math lessons (pre-algebra, algebra, precalculus), cool math games, online graphing calculators, geometry art, fractals, polyhedra, parents and teachers areas too. In the Arithmetic Progression calculator here enter the values for nth term (n), first term (a1) and the common difference (d) and you will get the nth term of the arithmetic sequence and the sum of the sequence. Arithmetic Sequence: An arithmetic sequence is defined as a group of numbers in which any two consecutive or successive terms have a common difference. the common difference between any two consecutive numbers is 4. An arithmetic sequence is a sequence that has the property that the difference between any two consecutive terms is a constant. Rule for ﬁnding the nth term in an arithmetic sequence The nth term of an arithmetic sequence is given by t n = a +(n −1)d where a (= t 1)isthe value of the ﬁrst term andd is the common difference. Arithmetic sequence formula. Above alternative formula should be understood as follows: if I want to calculate some selected element of the arithmetic sequence (a n a_{n} a n ), then I need to know the previous one (a n − 1) a_{n-1}) a n − 1 )) and the common difference (d d d). Arithmetic sequence equation calculator By applying this calculator for Arithmetic & Geometric Sequences, the n-th term and the sum of the first n terms in a sequence can be accurately obtained. So, we have the following answers. How to use this calculator: Use the dropdown menu to choose the sequence that you request the value of the term of the sequence (before or any other) Enter the difference Common / Any term of the sequence is t n (read t sub n), dependent on the value of n. To use the arithmetic sequence calculator , enter the values in the given input boxes. An arithmetic series is the sum of the terms of an arithmetic sequence. It's easier than you might think! Watch this tutorial and learn how to find the common difference in an arithmetic sequence. where d is the common difference between consecutive terms and a1 is the first term in the sequence. Example: Find Geometric Sequence, when the first term is 2, common relationship "r" is 4, and the number of terms is 10. Any property of the sequence can be calculated, such as common difference, n th term, the sum of the first n terms, or the first term. By using this website, you agree to our Cookie Policy. An example is shown where a 1 and d may entered as integers, decimals or fractions and n must be a positive integer. -Find the nth term, partial sum, and sum to infinity of a geometric sequence by providing a value for the initial term, common The calculator allows to calculate the terms of an arithmetic sequence between two indices of this sequence. 2 - 11\) $$= -0. Finding the common difference in an arithmetic sequence: To find the common difference in an arithmetic sequence, find the difference between any two consecutive terms. So, the formula for the \(n$$-th term is: $${ a }_{ n } ={ a }_{ 1 } + d ⋅ (n – 1),$$ where $$d$$ is the common Nov 08, 2021 · With our geometric sequence calculator, you can calculate the most important values of a finite geometric sequence. Arithmetic Sequences FYI: Common differences can be negative. Example: In the sequence of following numbers: 3, 7, 11, 15, 19, . Solution: Given that, The first term of the AP is 5. This constant is called the common difference, and is represented by the letter d. This online tool can help you find term and the sum of the first terms of an arithmetic progression. An arithmetic sequence, or arithmetic progression, is characterized by the fact that to get from any one term to the next we always add the same amount, known as the common difference. A sequence of numbers such that the difference between the consecutive terms is constant is called arithmetic sequence. Trying to find the common difference in an arithmetic sequence? You need to figure out what number you need to add to each term to get the next term in the sequence. In mathematics, an arithmetic sequence, or arithmetic progression is a sequence of numbers such that the difference between the consecutive terms is constant and is called the common difference. To find a term in an arithmetic sequence determine the common difference by subtracting the first number from the second number. Calculate the common difference of the above Arithmetic series. For example: 2, 4, 6, 8, 10… It can be calculated by adding a common difference in the first term. Step 3: Finally, the arithmetic sequence will be displayed in the output field. In general, the terms of an arithmetic sequence with the first term a 0 and common difference d, have the form a n = d n +a 0 (n=0,1,2,). Formulas: The formula for finding$n^{th}$term of an arithmetic progression is$\color{blue}{a_n = a_1 + (n-1) d}$, where$\color{blue}{a_1}$is the first term and$\color{blue}{d}$is the common difference. Also, this calculator can be used to solve much more complicated problems. d=10 the common difference, and then determine how often the common difference must be added to the first term to obtain the final term of the sequence. Free arithmetic sequences calculator find indices sums and common difference step by step this website uses cookies to ensure you get the best experience. This constant difference may be negative, or positive. Click Create Assignment to assign this modality to your LMS. Arithmetic progression (AP) is calculated using the formula given below with the common difference, first and last term of a series of numbers. a, a + d, a + 2d, a + 3d, a + 4d, … The number a is the first term, and d is the common difference of the sequence. We have a new and improved read on this topic. In contrast, an arithmetic sequence with a common difference of −3 is: 2, −1, −4, −7, 10. This lesson covers common difference of arithmetic sequences and writing an nth term rule given the common difference and a term. 4, 9, 14, 19, 24, . A1 ----> First term of the sequence. \ (a_n\) represents the value of the nth term of the sequence. Thus, to obtain the terms of an arithmetic sequence defined by u n = 3 + 5 ⋅ n between 1 and 4 , enter : sequence ( 3 + 5 ⋅ n; 1; 4; n) after calculation, the result is returned. Arithmetic and Geometric and Harmonic Sequences Calculator: Determine Sequence Expand Sequence-- Enter Series-- (Optional) Number of Expansion terms Definition: An arithmetic sequence is a sequence of the form . Oct 21, 2017 · The primary difference between arithmetic and geometric sequence is that a sequence can be arithmetic, when there is a common difference between successive terms, indicated by 'd',. The number of terms in the sequence = 6 (one term for each hour). In arithmetic sequences, the difference between the successive terms remains the same. 9 –4 = 5 14 –9 = 5 19 –14 = 5 24 –19 = 5 arithmetic sequence The common difference, d, is 5. Arithmetic Progression - Calculator Enter the first term : Enter the common difference : Arithmetic Progression : Sum of first n Aug 25, 2021 · Hence, the common difference of the given series is 5. On the contrary, when there is a common ratio between successive terms, represented by 'r, the sequence is said to be geometric. For instance, the sequence 3, 5, 7, 9, 11, 13 is an arithmetic progression with common difference 2. The first five terms of an arithmetic sequence are shown on the graph. To find the common difference, subtract a term from the one before it. the first member a 1. When we sum a finite number of terms in an arithmetic sequence, we get a finite arithmetic series. An online arithmetic sequence calculator will allow you to determine the arithmetic sequence, nth term, and the sum of a sequence with a common difference. Example 2 Identifying aand din an arithmetic sequence For the arithmetic sequence 30,28,26,24,,write down the values of a, d and t 3 An arithmetic sequence is a sequence of numbers, such that the difference between any term and the previous term is a constant number called the common difference (\ (d\)): \ (d\) is the common difference. Click "Zoom In" or "Zoom Out" to view all five terms in the sequence. Arithmetic Progression calculators give you a list of online Arithmetic Progression calculators. The nth term of an arithmetic sequence is given by: a n = a 1 + (n – 1)d. Arithmetic Sequence: d = −2 d = - 2. Arithmetic sequence formula Formula to find sum of arithmetic sequence/progression is: S = n/2 × [2a₁ + (n - 1)d] Formula to find nth term is: an = a + (n - 1)d In this equation, a₁ is the first term of the sequence, an is the nᵗʰ term of the sequence, d is a common difference. We review their content and use your feedback to keep the quality high. Interact on desktop, mobile and cloud with the free Wolfram Player or other Wolfram Language products. a_4-a_3=-2--12=10. Calculate arithmetic sequence from the series of numbers easily with this online calculator.  2021/02/03 15:02 20 years old level / Others / Very / Purpose of use Arithmetic Sequence Calculator.$\$ Where, a =nth term a = First term r = common relationship However, an online Arithmetic sequence calculator allows you to calculate the value nth, sum and arithmetic sequence. Nickzom calculates the common difference of an arithmetic progression online with step by step presentation. Its small and displays the correct answer everytime. Any ordered list of numbers is considered a sequence. If the terms of a sequence differ by a constant, we say the sequence is arithmetic. Reference > Mathematics > Algebra > Sequences and Series. How to use this calculator:Use the dropdown menu to choose the sequence you requireInsert the n-th term value of the sequence (first or any other)Insert common difference / common ratio An arithmetic progression is a sequence of numbers such that the difference between the consecutive terms is constant. Step 2: Now click the button “Calculate Arithmetic Sequence” to get the answer. Feb 24, 2021 · As it follows the common difference procedure therefore it can be concluded that the given sequence is an arithmetic sequence and common difference ‘d’ is calculated to be as. Find the common difference by subtracting any term in the sequence from the term that comes after it. A finite sequence has a finite number of terms whereas an infinite sequence has an infinite number of terms An ARITHMETIC SEQUENCE is an ordered list of terms in which the difference 5. In this case, there is a difference of 2 each time. The difference of the sequence is constant and equals the difference between two consecutive terms. In the next section, we will explain the method to calculate the arithmetic sequence using common and first term difference. Common ration — Ratio between the term aₙ and the The common difference is 2 and the sequence is an arithmetic sequence. Example: Write the common difference in the sequence given below. In this equation . Dec 21, 2018 · Arithmetic sequences and sums sequence. These values include the common ratio, the initial term, the last term and the number of terms. This constant is called the common difference. 1. A sequence is arithmetic if the differences between consecutive terms are the same. II. In this case, adding −2 - 2 to the previous term in the sequence gives the next term. in which each term after the first is formed by adding a constant (common difference) to the preceding term. The The number a is the first term, and d is the common difference of the sequence. There are no specific fan to find arithmetic sequence. The nth term of an arithmetic sequence is calculated using the arithmetic sequence formula. Start with -10 and add 18 fifty-nine times in order to arrive at the 60th term. August 12, 2021 by. Arithmetic Progression (AP) Calculator Sum of Natural, Odd or Even Numbers Series Calculator getcalc. Thanks for writing. View the full answer. Is an arithmetic sequence because 2 is added every time to get to the next term. common difference arithmetic sequence calculator

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