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 A124411 #13 Aug 04 2019 04:23:48
%S A124411 12705,13020,105525,256410,966840,1707510,1944495,2310000,2478630,
%T A124411 3132675,3836070,3976770,4112430,4532325,5499585,5920005,6610485,
%U A124411 7390845,8552250,10739505,11120340,12231450,12338130,13243230,16467255
%N A124411 Numbers k such that 2k+1, 4k+1, 6k+1, 8k+1, 10k+1 and 12k+1 are primes.
%H A124411 Jinyuan Wang, <a href="/A124411/b124411.txt">Table of n, a(n) for n = 1..100</a>
%t A124411 Select[Range[10^7], And @@ PrimeQ /@ ({2, 4, 6, 8, 10, 12}*# + 1) &] (* _Ray Chandler_, Nov 20 2006 *)
%o A124411 (PARI) is(k) = sum(j = 1, 6, isprime(2*j*k+1)) == 6; \\ _Jinyuan Wang_, Aug 04 2019
%Y A124411 Cf. A005097, A005098, A024899, A005123, A024912, A110801, A123998, A124408, A124409, A124410, A071576.
%K A124411 nonn
%O A124411 1,1
%A A124411 _Artur Jasinski_, Oct 31 2006
%E A124411 Extended by _Ray Chandler_, Nov 20 2006