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 A007644 Primes not of form | 3^a +- 2^b | where a, b are nonnegative integers. (Formerly M5307) 3
 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; text; internal format)
 OFFSET 1,1 COMMENTS Contains all primes congruent to 53, 77 or 103 modulo 120. - Jianing Song, Feb 15 2020 REFERENCES N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS 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. EXAMPLE 127 = 2^7 - 3^0, so 127 is not a member. 257 = 3^0 + 2^8, so 257 is not a member. CROSSREFS Cf. A007643, A004051, A103146. Sequence in context: A301479 A244187 A045807 * A136073 A133187 A057667 Adjacent sequences:  A007641 A007642 A007643 * A007645 A007646 A007647 KEYWORD nonn AUTHOR EXTENSIONS Minor edits by N. J. A. Sloane, Jun 27 2010 More terms from Jon E. Schoenfield, Jun 30 2010 STATUS approved

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Last modified July 31 10:14 EDT 2021. Contains 346373 sequences. (Running on oeis4.)