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 A124409 #9 Aug 04 2019 05:53:13
%S A124409 165,765,1530,2130,2475,3420,5415,7695,9060,11505,12705,13020,15885,
%T A124409 16650,20055,20745,22530,24915,26940,29670,32925,35070,36885,39270,
%U A124409 44370,47730,48465,54735,55860,56310,58860,65655,66600,67365,67650
%N A124409 Numbers k such that 2k+1, 4k+1, 6k+1 and 8k+1 are primes.
%H A124409 Jinyuan Wang, <a href="/A124409/b124409.txt">Table of n, a(n) for n = 1..2000</a>
%t A124409 Select[Range[68000], And @@ PrimeQ /@ ({2, 4, 6, 8}*# + 1) &] (* _Ray Chandler_, Nov 20 2006 *)
%o A124409 (PARI) is(k) = sum(j = 1, 4, isprime(2*j*k+1)) == 4; \\ _Jinyuan Wang_, Aug 04 2019
%Y A124409 Cf. A005097, A005098, A024899, A005123, A123998, A124408, A124410, A124411, A071576.
%K A124409 nonn
%O A124409 1,1
%A A124409 _Artur Jasinski_, Oct 31 2006