Prime Curios!: 281683

281683
(another Prime Pages' Curiosity)

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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: 2003-12-01 20:26:40; Last Modified: 2008-01-30 11:28:00.