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A007644
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Primes not of form | 3^a +- 2^b | where a, b are nonnegative integers.
(Formerly M5307)
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2
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53, 71, 103, 107, 109, 149, 151, 157, 163, 167, 173, 181, 191, 193, 197, 199, 223, 233, 263, 271, 277, 281, 293, 311, 313, 317, 331, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| Problem 1404, Math. Mag., 65 (1992), 265.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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EXAMPLE
| 127 = 2^7 - 3^0, so 127 is not a member.
257 = 3^0 + 2^8, so 257 is not a member.
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CROSSREFS
| Cf. A007643, A004051, A103146.
Sequence in context: A034965 A160029 A045807 * A136073 A133187 A057667
Adjacent sequences: A007641 A007642 A007643 * A007645 A007646 A007647
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein, Robert G. Wilson v (rgwv(AT)rgwv.com)
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EXTENSIONS
| Minor edits by N. J. A. Sloane (njas(AT)research.att.com), Jun 27 2010
More terms from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Jun 30 2010
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