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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
Sequence in context: A301479 A244187 A045807 * A136073 A133187 A057667
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 March 28 16:58 EDT 2024. Contains 371254 sequences. (Running on oeis4.)