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A176278 Numbers of the form 6k-1 with the least prime divisor of the form 6m+1. 1
77, 119, 161, 203, 221, 287, 299, 329, 371, 377, 413, 437, 497, 533, 539, 551, 581, 611, 623, 689, 707, 749, 767, 779, 791, 833, 893, 917, 923, 959, 1001, 1007, 1043, 1079, 1121, 1127, 1157, 1169, 1211, 1253, 1271, 1313, 1337, 1349, 1379, 1391, 1421, 1457 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

By definition, all terms are composite numbers.

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

MATHEMATICA

Select[Range[11, 2581, 6], 1==Mod[FactorInteger[ # ][[1, 1]], 6]&] (* Zak Seidov, Apr 14 2010 *)

PROG

(PARI) isok(n) = ((n % 6) == 5) && ((vecmin(factor(n)[, 1]) % 6) == 1); \\ Michel Marcus, Feb 08 2016

CROSSREFS

Cf. A176275, A176274, A176262, A176258, A176257, A176256, A176255, A108166, A016969, A007528.

Sequence in context: A274967 A229826 A330103 * A105998 A039444 A118611

Adjacent sequences:  A176275 A176276 A176277 * A176279 A176280 A176281

KEYWORD

nonn

AUTHOR

Vladimir Shevelev, Apr 14 2010

EXTENSIONS

Corrected (erroneous 341 deleted) and extended by Zak Seidov, Apr 14 2010

STATUS

approved

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Last modified May 25 08:35 EDT 2020. Contains 334585 sequences. (Running on oeis4.)