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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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12
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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).
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LINKS
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Table of n, a(n) for n=1..10.
Paul Bourdelais, A Generalized Repunit Conjecture
H. Dubner, Generalized repunit primes, Math. Comp., 61 (1993), 927-930.
H. Dubner, Generalized repunit primes, Math. Comp., 61 (1993), 927-930. [Annotated scanned copy]
H. Lifchitz, Mersenne and Fermat primes field
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MATHEMATICA
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lst={}; Do[If[PrimeQ[(14^n-1)/13], Print[n]; AppendTo[lst, n]], {n, 10^5}]; lst (* Vladimir Joseph Stephan Orlovsky, Aug 21 2008 *)
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PROG
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(PARI) is(n)=isprime((14^n - 1)/13) \\ Charles R Greathouse IV, Apr 29 2015
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CROSSREFS
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Sequence in context: A056725 A091738 A136054 * A240072 A066148 A093932
Adjacent sequences: A006029 A006030 A006031 * A006033 A006034 A006035
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KEYWORD
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hard,nonn,more
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AUTHOR
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N. J. A. Sloane.
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EXTENSIONS
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One more term from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008
a(8) and a(9) correspond to probable primes discovered by Paul Bourdelais, Mar 01 2010
a(10) corresponds to a probable prime discovered by Paul Bourdelais, Dec 08 2014
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STATUS
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approved
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