Online calculator to calculate the sum of the first n terms and the nth term of an arithmetic sequence.
If A1, A2, ... , An, ... is an arithmetic sequence with common difference d, this calculator calculates the sum Sn given by
Sn = A1 + A2 + ... + An = (n/2)(A1 + An)
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How to use the calculator
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. An example is shown where a_{1} and d may entered as integers, decimals or fractions and n must be a positive integer.
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