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Search: id:A002236
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| A002236 |
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Numbers n such that 9*2^n - 1 is prime.
(Formerly M2634 N1045)
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+0
2
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| 1, 3, 7, 13, 15, 21, 43, 63, 99, 109, 159, 211, 309, 343, 415, 469, 781, 871, 939, 1551, 3115, 3349, 5589, 5815, 5893, 7939, 8007, 11547, 12495, 22555, 23647, 35647, 83415, 103059, 184999, 275859, 384243, 484975, 503893, 828709
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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1010277 is also in the sequence. - Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
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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).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
H. Riesel, Lucasian criteria for the primality of N=h.2^n-1, Math. Comp., 23 (1969), 869-875.
H. Riesel, ``Prime numbers and computer methods for factorization,'' Progress in Mathematics, Vol. 57, Birkhauser, Boston, 1985, Chap. 4, see pp. 381-384.
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LINKS
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Wilfrid Keller, List of primes k.2^n - 1 for k < 300
C. K. Caldwell, The Prime Pages
Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime
Kosmaj, Riesel list k<300.
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CROSSREFS
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Cf. A050524.
Sequence in context: A035496 A056530 A092734 this_sequence A080565 A164344 A002254
Adjacent sequences: A002233 A002234 A002235 this_sequence A002237 A002238 A002239
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KEYWORD
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hard,nonn,nice
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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 Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
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