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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) 496789 is the smallest prime such that if F(p) = 2*p^21, 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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