281683
This number is a prime.
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281683 is the smallest prime such that if F(p) = 2*p^2-1, then F(281683), F(F(281683)), F(F(F(281683))), and F(F(F(F(281683)))) are also primes. [Opao]
Submitted: 2003-12-02 02:26:40; Last Modified: 2008-01-30 17:28:00.
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