496789

This number is a prime.

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496789 is the smallest prime such that if F(p) = 2*p^2-1, then F(496789), F(F(496789)), F(F(F(496789))), F(F(F(F(496789)))), and F(F(F(F(F(496789))))) are also primes. [Opao]

Submitted: 2003-12-02 02:51:29; Last Modified: 2008-01-30 17:28:00.