Fibonacci Product

Calculus Level 5

n = 2 ( 1 2 F n + 1 2 F n 1 2 + 1 ) \large \prod_{n=2}^\infty \left(1-\dfrac{2}{F_{n+1}^2-F_{n-1}^2+1}\right)

Let F n F_n denote the n n th Fibonacci number , F 0 = 0 , F 1 = 1 F_0 = 0, F_1 = 1 and F n = F n 1 + F n 2 F_n = F_{n-1} + F_{n-2} where n = 2 , 3 , 4 , n=2,3,4,\ldots .

If the product above is equal to A B \dfrac AB , where A A and B B are coprime positive integers, find A + B A+B .


The answer is 4.

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