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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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3
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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
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OFFSET
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1,1
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COMMENTS
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Contains all primes congruent to 53, 77 or 103 modulo 120. - Jianing Song, Feb 15 2020
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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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H. Gauchman and I. Rosenholtz (Proposers), R. Martin (Solver), Difference of prime powers, Problem 1404, Math. Mag., 65 (No. 4, 1992), 265; Solution, Math. Mag., 66 (No. 4, 1993), 269.
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EXAMPLE
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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
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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