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Posted by on Tuesday, June 18, 2013 at 2:07pm.

Find the sum of all primes p, such that p divides up, where up is the p- th Fibonacci number.

please tell me the answer it's urgent about this..///

  • math - , Tuesday, July 9, 2013 at 6:49pm

    If we use binets formula for the fibonacci numbers we can trivially see that Fp=5^(p-1)/2 mod p implying that the only prime p such that p divides Fp is 5 divides F5=5.

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