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 A176275 #12 Jun 02 2025 02:50:29 %S A176275 25,55,85,115,121,145,175,187,205,235,253,265,289,295,319,325,355,385, %T A176275 391,415,445,451,475,493,505,517,529,535,565,583,595,625,649,655,667, %U A176275 685,697,715,745,775,781,799,805,835,841,865,895,901,913,925,943,955,979,985,1003,1015,1045,1075 %N A176275 Numbers of the form 6k+1 with the least prime divisor of the form 6m-1. %C A176275 All terms of A108166 are in the sequence. %H A176275 Harvey P. Dale, <a href="/A176275/b176275.txt">Table of n, a(n) for n = 1..1000</a> %t A176275 Select[6*Range[200] + 1, IntegerQ[(FactorInteger[#][[1, 1]] + 1)/6] &] (* _Harvey P. Dale_, Sep 19 2018 *) %o A176275 (PARI) isok(n) = ((n % 6) == 1) && (n != 1) && ((vecmin(factor(n)[,1]) % 6) == 5); \\ _Michel Marcus_, Feb 08 2016 %Y A176275 Cf. A176274, A176262, A176256, A176257, A176258, A176255, A108166, A016969, A007528. %K A176275 nonn %O A176275 1,1 %A A176275 _Vladimir Shevelev_, Apr 14 2010 %E A176275 Corrected by _R. J. Mathar_, May 03 2013