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Number Sequence Calculator

There are many different types of number sequences. The following are calculators for some of them.

Arithmetic Sequence Calculator

definition: fn = fn-1 + f
example: 1, 3, 5, 7, 9 11, 13, ...

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

Geometric Sequence Calculator

definition: fn = fn-1 * r
example: 1, 2, 4, 8, 16, 32, 64, 128, ...

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

Fibonacci Sequence Calculator

definition: f0=0; f1=1; fn=fn-1+fn-2;
example: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, ...

the number to obtain