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A057178
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Numbers k such that (12^k + 1)/13 is a prime.
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17
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5, 11, 109, 193, 1483, 11353, 21419, 21911, 24071, 106859, 139739, 495953
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OFFSET
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1,1
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COMMENTS
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(12^1483 + 1)/13, a 1600-digit number, has now been certified prime with Primo. - Rick L. Shepherd, May 01 2002
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LINKS
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J. Brillhart et al., Factorizations of b^n +- 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
Eric Weisstein's World of Mathematics, Repunit
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008
a(10) corresponds to a probable prime, discovered by Paul Bourdelais, Feb 08 2010
a(11) corresponds to a probable prime, discovered by Paul Bourdelais, Sep 21 2011
a(12) corresponds to a probable prime, discovered by Paul Bourdelais, Nov 13 2018
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STATUS
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approved
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