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A006032
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Numbers n such that (14^n - 1)/13 is prime.
(Formerly M2670)
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16
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OFFSET
| 1,1
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REFERENCES
| H. Dubner, Generalized repunit primes, Math. Comp., 61 (1993), 927-930.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| H. Lifchitz, Mersenne and Fermat primes field
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MATHEMATICA
| lst={}; Do[If[PrimeQ[(14^n-1)/13], Print[n]; AppendTo[lst, n]], {n, 10^5}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 21 2008]
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CROSSREFS
| Sequence in context: A056725 A091738 A136054 * A066148 A093932 A141173
Adjacent sequences: A006029 A006030 A006031 * A006033 A006034 A006035
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KEYWORD
| hard,nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| One more term from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008
a(8)=59693 & a(9)=67421 are probable primes discovered by Paul Bourdelais (pbourdelais(AT)radiantblue.com), Mar 01 2010
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