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Search: id:A002959
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| A002959 |
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Numbers n such that 2*7^n - 1 is prime.
(Formerly M0979)
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+0
7
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| 1, 2, 4, 5, 14, 24, 29, 36, 46, 80, 474, 1018, 5180
(list; graph; listen)
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OFFSET
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1,2
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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).
C. R. Zarnke and H. C. Williams, Computer determination of some large primes, pp. 563-570 in Proceedings of the Louisiana Conference on Combinatorics, Graph Theory and Computer Science. Vol. 2, edited R. C. Mullin et al., 1971.
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MATHEMATICA
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Do[ If[ PrimeQ[ 2*7^n - 1 ], Print[n] ], {n, 1, 10000} ]
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CROSSREFS
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Sequence in context: A000063 A039574 A121410 this_sequence A071316 A056401 A056406
Adjacent sequences: A002956 A002957 A002958 this_sequence A002960 A002961 A002962
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KEYWORD
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nonn,hard
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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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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 05 2001
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