Number Sequence Generator

Generate arithmetic sequences (add a constant) or geometric sequences (multiply by a constant). Enter the first term, common difference or ratio, and number of terms to get the full sequence and its sum.

Arithmetic sequence sum: n×(a₁+aₙ)/2. Geometric sequence sum: a₁×(rⁿ-1)/(r-1) when r≠1. These formulas appear in finance (annuities), computer science (runtime analysis), and physics (constant acceleration).