Posted by jack 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  George, Tuesday, July 9, 2013 at 6:49pm
If we use binets formula for the fibonacci numbers we can trivially see that Fp=5^(p1)/2 mod p implying that the only prime p such that p divides Fp is 5 divides F5=5.