the first number
common difference (f)
nth number to obtain

Geometric Sequence Calculator

definition: an = a × rn-1 example: 1, 2, 4, 8, 16, 32, 64, 128, ...

the first number
common ratio (r)
nth number to obtain

Fibonacci Sequence Calculator

definition: a0=0; a1=1; an = an-1 + an-2;example: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, ...

nth number to obtain