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A188803
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Primes that divide 2^(2^100) - 1 and 10^(10^100) - 1.
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0
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OFFSET
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1,1
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COMMENTS
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Probably there are no more terms. [Arkadiusz Wesolowski, Jul 12 2011]
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LINKS
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Table of n, a(n) for n=1..10.
Dario A. Alpern, Known prime factors of Googolplex - 1
G. L. Honaker, Jr. and Chris Caldwell, Prime Curios! 167772161
Eric Weisstein's World of Mathematics, Fermat Number
Eric Weisstein's World of Mathematics, Googolplex
Eric Weisstein's World of Mathematics, Greatest Common Divisor
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MATHEMATICA
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Select[Sort[Flatten[Table[z = k*2^n + 1; If[PowerMod[2, 2^100, z] == PowerMod[10, 10^100, z] == 1, z], {k, 1, 21, 2}, {n, 75}]]], PrimeQ] (* Arkadiusz Wesolowski, Sep 08 2011 *)
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CROSSREFS
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Cf. A023394.
Sequence in context: A322737 A201107 A210902 * A084040 A009495 A153487
Adjacent sequences: A188800 A188801 A188802 * A188804 A188805 A188806
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KEYWORD
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fini,full,nonn
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AUTHOR
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Arkadiusz Wesolowski, Apr 12 2011
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STATUS
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approved
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