

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
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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



