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 A124412 #12 Mar 23 2020 04:05:32
%S A124412 765,1065,1155,1530,3105,3420,3705,5160,6840,7695,8325,9060,11265,
%T A124412 11505,12195,14835,15390,15885,16650,17655,20745,22185,23205,27300,
%U A124412 28155,28995,30165,30690,33300,33825,39015,41715,42690,44370,48465,49935
%N A124412 Numbers k such that 2*k+1, 4*k+1, 8*k+1 and 16*k+1 are primes.
%H A124412 Amiram Eldar, <a href="/A124412/b124412.txt">Table of n, a(n) for n = 1..10000</a>
%t A124412 Select[15*Range[3500], And @@ PrimeQ /@ ({2, 4, 8, 16}*# + 1) &] (* _Ray Chandler_, Nov 21 2006 *)
%Y A124412 Cf. A005097, A123998, A124041, A124413-A124417.
%K A124412 nonn
%O A124412 1,1
%A A124412 _Artur Jasinski_, Nov 02 2006