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A002237
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Numbers n such that 15*2^n-1 is prime.
(Formerly M0976 N0365)
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0
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1, 2, 4, 5, 10, 14, 17, 31, 41, 73, 80, 82, 116, 125, 145, 157, 172, 202, 224, 266, 289, 293, 463, 1004, 1246, 2066, 2431, 2705, 4622, 5270, 7613, 21727, 21962, 40742, 41054, 60622, 83263, 83669, 91457, 103940, 104177, 108124, 115327, 161453, 172714, 454681, 568780, 656264, 712294, 902474, 1084010, 1344313
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| 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.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300
Wilfrid Keller, List of primes k.2^n - 1 for k < 300
Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime
Discussion group for the primality-testing program, PrimeForm.
Kosmaj, Riesel list k<300.
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CROSSREFS
| Cf. A002258: 15*2^n+1 is prime.
Sequence in context: A133585 A154318 A008283 * A067935 A097133 A023165
Adjacent sequences: A002234 A002235 A002236 * A002238 A002239 A002240
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KEYWORD
| hard,nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Simon Plouffe (simon.plouffe(AT)gmail.com)
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EXTENSIONS
| More terms from Hugo Pfoertner (hugo(AT)pfoertner.org), Jun 29 2004
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
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