Fibonacci Number(redirected from Tribonacci numbers)
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Fibonacci number[¦fib·ə¦nä·chē ′nəm·bər]
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.