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 A172016 #7 Nov 19 2019 14:44:32
%S A172016 35,37,65,67,77,79,95,97,125,127,155,157,161,163,209,211,221,223,275,
%T A172016 277,305,307,329,331,335,337,365,367,371,373,377,379,395,397,407,409,
%U A172016 437,439,455,457,485,487,497,499,539,541,545,547,575,577,605,607,611
%N A172016 Numbers of the form 6*k-+1 such that 6*k-1=nonprime and 6*k+1=prime.
%H A172016 Harvey P. Dale, <a href="/A172016/b172016.txt">Table of n, a(n) for n = 1..1000</a>
%t A172016 Select[#+{-1,1}&/@(6Range[200]),CompositeQ[#[[1]]]&&PrimeQ[#[[2]]]&]// Flatten (* _Harvey P. Dale_, Nov 19 2019 *)
%Y A172016 A171688 U A171697 U A172015 U A172016 = A007310.
%K A172016 nonn
%O A172016 1,1
%A A172016 _Juri-Stepan Gerasimov_, Jan 22 2010
%E A172016 Entries checked by _R. J. Mathar_, Apr 14 2010