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A162856 Those primes not in sequence A162855. 1
19, 43, 53, 59, 79, 83, 89, 101, 103, 107, 109, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 197, 211, 229, 233, 239, 241, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 389, 397, 401, 409, 419, 421 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..53.

EXAMPLE

59, a prime, in binary is 111011. There is a run of three 1's, followed by a run of one 0, followed by a run of two 1's. There is only one other permutation of these runs that starts with a run of 1's, is followed by a run of the single 0, and finishes with a run of 1s. The other such binary number is 110111, which is 55. Since 55 is composite, then 59 is in this sequence.

CROSSREFS

Cf. A162855

Sequence in context: A270123 A139811 A095101 * A095086 A095079 A238676

Adjacent sequences:  A162853 A162854 A162855 * A162857 A162858 A162859

KEYWORD

base,nonn

AUTHOR

Leroy Quet, Jul 14 2009

EXTENSIONS

Extended by Ray Chandler, Dec 18 2009

STATUS

approved

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Last modified July 24 04:25 EDT 2021. Contains 346273 sequences. (Running on oeis4.)