The book is now available! 496789
(another Prime Pages' Curiosity)
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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]




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