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A059676
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Numbers n such that n*5^n - 1 is prime.
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13
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8, 14, 42, 384, 564, 4256, 6368, 21132, 27180, 96584, 349656, 545082
(list;
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..12.
Steven Harvey, Generalized Woodall Search
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MATHEMATICA
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Do[ If[ PrimeQ[ n*5^n - 1 ], Print[ n ]], {n, 1, 4000} ]
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PROG
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(PARI) is(n)=ispseudoprime(n*5^n-1) \\ Charles R Greathouse IV, May 22 2017
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CROSSREFS
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Sequence in context: A121866 A301961 A250478 * A242198 A111050 A009453
Adjacent sequences: A059673 A059674 A059675 * A059677 A059678 A059679
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v, Feb 05 2001
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EXTENSIONS
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More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008
a(11)-a(12) from Harvey link by Ray Chandler, Apr 10 2016
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STATUS
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approved
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