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 A139406 #11 Mar 19 2020 06:54:02
%S A139406 12,24,39,57,84,96,117,126,162,186,201,234,249,267,297,309,327,336,
%T A139406 354,357,369,402,432,441,459,462,474,516,519,564,591,621,654,696,711,
%U A139406 717,732,777,822,942,969,984,1011,1029,1086,1092,1116,1167,1179,1272,1341
%N A139406 Numbers k such that 8*k+1 and 8*k+5 are primes.
%H A139406 Amiram Eldar, <a href="/A139406/b139406.txt">Table of n, a(n) for n = 1..10000</a>
%t A139406 a = {}; Do[If[PrimeQ[8 n + 1] && PrimeQ[8 n + 5], AppendTo[a, n]], {n, 1, 1000}]; a
%t A139406 Select[Range[1500],And@@PrimeQ[8 #+{1,5}]&] (* _Harvey P. Dale_, Aug 14 2011 *)
%Y A139406 Cf. A125821, A125822, A139402, A139404, A139405, A139407.
%K A139406 nonn
%O A139406 1,1
%A A139406 _Artur Jasinski_, Apr 19 2008