Series & Sequence Calculator

Number series are fundamental to algebra and calculus.

What this calculator does

Arithmetic: aₙ = a₁ + (n−1)d.

How it works

Geometric: aₙ = a₁ × r^(n−1).

Frequently asked questions

What is an arithmetic sequence?

A sequence where each term differs from the previous by a constant: 2, 5, 8, 11...