This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A176278 #10 Nov 27 2019 05:29:45 %S A176278 77,119,161,203,221,287,299,329,371,377,413,437,497,533,539,551,581, %T A176278 611,623,689,707,749,767,779,791,833,893,917,923,959,1001,1007,1043, %U A176278 1079,1121,1127,1157,1169,1211,1253,1271,1313,1337,1349,1379,1391,1421,1457 %N A176278 Numbers of the form 6k-1 with the least prime divisor of the form 6m+1. %C A176278 By definition, all terms are composite numbers. %H A176278 Amiram Eldar, <a href="/A176278/b176278.txt">Table of n, a(n) for n = 1..10000</a> %t A176278 Select[Range[11,2581,6],1==Mod[FactorInteger[ # ][[1,1]],6]&] (* _Zak Seidov_, Apr 14 2010 *) %o A176278 (PARI) isok(n) = ((n % 6) == 5) && ((vecmin(factor(n)[,1]) % 6) == 1); \\ _Michel Marcus_, Feb 08 2016 %Y A176278 Cf. A176275, A176274, A176262, A176258, A176257, A176256, A176255, A108166, A016969, A007528. %K A176278 nonn %O A176278 1,1 %A A176278 _Vladimir Shevelev_, Apr 14 2010 %E A176278 Corrected (erroneous 341 deleted) and extended by _Zak Seidov_, Apr 14 2010