olymmath

KöMaL 2008 A459

    Denote by FnF_n the nnth Fibonacci number (F0F_0=0, F1F_1=1, Fk+1F_{k+1}=FkF_k+Fk−1F_{k-1}). Show that one can find a positive integer nn, having at least 1000 distinct prime divisors, such that nn divides FnF_n.

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