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Search: id:A016054
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| A016054 |
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Numbers n such that (13^n - 1)/12 is prime.
(Formerly M2708)
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+0
16
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| 5, 7, 137, 283, 883, 991, 1021, 1193, 3671, 18743, 31751
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
H. Dubner, Generalized repunit primes, Math. Comp., 61 (1993), 927-930.
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LINKS
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H. Lifchitz, Mersenne and Fermat primes field
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MATHEMATICA
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lst={}; Do[If[PrimeQ[(13^n-1)/12], Print[n]; AppendTo[lst, n]], {n, 10^5}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 21 2008]
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CROSSREFS
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Sequence in context: A165784 A088270 A065927 this_sequence A158969 A083842 A164372
Adjacent sequences: A016051 A016052 A016053 this_sequence A016055 A016056 A016057
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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Error in first term corrected Aug 15 1997 by Robert G. Wilson v (rgwv(AT)rgwv.com).
18743 (probable prime) from David Radcliffe (radcl008(AT)umn.edu), Jul 04 2004
One more term from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008
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