Number Sequence Calculator

Generate arithmetic and geometric sequences with formulas for the nth term and sum.

Sequence Type

First Term (a)

Common Difference (d)

Number of Terms (n)

Arithmetic Sequence

3.0000,5.0000,7.0000,9.0000,11.0000,13.0000,15.0000,17.0000,19.0000,21.0000

Nth Term (aₙ)

21.0000

Sum (Sₙ)

120.0000

Number of Terms

Nth term: aₙ = a + (n-1)d = 21.0000

Sum formula: Sₙ = n/2 × [2a + (n-1)d] = 120.0000