5

This number is a prime.

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The only prime p such that p divides the p^th Fibonacci number. All other primes divide either the (p-1)^st Fibonacci number if p = 1,4 mod 5 or (p+1)^st Fibonacci number if p = 2,3 mod 5. [Rupinski]

Submitted: 2008-09-17 15:09:06;   Last Modified: 2008-09-20 18:15:10.
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