Free Arithmetic Sequence & Series Calculator (Nth Term & Sum) Online
Calculate the Nth term a_n = a₁ + (n - 1)d, common difference d, and partial sum S_n of an arithmetic progression. — 100% free online utility, zero sign-up, zero paywalls, and private client-side processing.
How It Works
Enter First Term (a₁)
Input sequence starting value.
Enter Common Difference (d)
Input step increment between consecutive terms.
Enter Term Index (n)
Specify target term number.
Review Nth Term & Sum
View a_n and cumulative series sum S_n = n(a₁ + a_n)/2.
Frequently Asked Questions
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