What are Fibonacci's numbers?

Answer 1

Fibonacci numbers are the numbers in a sequence defined as follows:

N1 = 1

N2 = 1

and after that, each number is the sum of the last two numbers in the sequence.

N3 = N1 + N2

N4 = N2 + N3 and so on.

Answer 2

The Fibonacci numbers are elements of a sequence defined as:f(1) = 1

f(2) = 1

and f(n) = f(n-2) + f(n-1) for all n = 3, 4, 5, ...