nth term (aₙ)
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Sum (Sₙ)
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Step by step
Find the nth term and the sum of an arithmetic sequence from the first term, the common difference and how many terms.
Step by step
Enter the first term, common difference and term count.
a₁ is the first term, d is the constant amount added each step, and n is how many terms.
aₙ = a₁ + (n − 1)d gives the value of the nth term.
Sₙ = n(2a₁ + (n − 1)d) ⁄ 2 adds the first n terms.