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 A124519 #17 Dec 17 2019 07:39:17
%S A124519 1,5,6,9,15,16,19,20,26,29,35,36,50,55,69,85,86,91,96,110,119,121,124,
%T A124519 134,135,139,149,156,161,169,174,176,189,195,216,224,226,250,260,264,
%U A124519 271,275,280,281,289,294,295,306,314,321,335,341,344,355,356,379,399
%N A124519 Numbers k such that 12*k - 1 and 12*k + 1 are twin primes.
%H A124519 Amiram Eldar, <a href="/A124519/b124519.txt">Table of n, a(n) for n = 1..10000</a>
%e A124519 1 is in the sequence since 12*1 - 1 = 11 and 12*1 + 1 = 13 are twin primes.
%t A124519 Select[Range[400], And @@ PrimeQ[{-1, 1} + 12# ] &] (* _Ray Chandler_, Nov 16 2006 *)
%Y A124519 Cf. A040040, A045753, A002822, A124065, A124518, A124520, A124521, A124522, A063983.
%K A124519 nonn
%O A124519 1,2
%A A124519 _Artur Jasinski_, Nov 04 2006
%E A124519 Extended by _Ray Chandler_, Nov 16 2006