Fibonacci

Fibonacci[n] gives the nth Fibonacci number.

Fibonacci[n, x] gives the Fibonacci polynomial Fₙ(x).

Examples

Get Fibonacci numbers:

Fibonacci[10]
(* 55 *)

Generate a sequence:

Table[Fibonacci[n], {n, 1, 10}]
(* {1, 1, 2, 3, 5, 8, 13, 21, 34, 55} *)

A large Fibonacci number:

Fibonacci[100]
(* 354224848179261915075 *)

Please visit the official Wolfram Language Reference for more details.