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A007644 Primes not of form | 3^a +- 2^b | where a, b are nonnegative integers.
(Formerly M5307)
2
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

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=1..52.

H. Gauchman & I. Rosenholtz, Problem 1404, Math. Mag., 65 (1992), 265.

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

N. J. A. Sloane, Mira Bernstein, Robert G. Wilson v

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 May 21 15:27 EDT 2019. Contains 323444 sequences. (Running on oeis4.)