Fibonacci Number

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Fibonacci number

[¦fib·ə¦nä·chē ′nəm·bər]
A number in the Fibonacci sequence whose first two terms are f1= f2= 1.

Fibonacci Number


any term in the recursive number sequence 1, 1, 2, 3, 5, 8,.... In this sequence, which is called a Fibonacci sequence, each term, after the second, is the sum of the two previous terms. Fibonacci numbers are named for the medieval mathematician Leonardo Fibonacci.


Vorob’ev, N. N. Chisla Fibonachchi, 3rd ed. Moscow, 1969.