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 A076504 #48 Feb 24 2024 01:04:24
%S A076504 12,60,1320,1620,4260,5100,6660,6780,11700,12540,21060,66360,83220,
%T A076504 88260,107100,110880,114660,127680,130200,140760,141960,144540,148200,
%U A076504 149520,157560,161340,163860,175080,186480,204600,230940,249540
%N A076504 Numbers k such that (k-1, k+1) and (k/2-1, k/2+1) are both pairs of twin primes.
%C A076504 Terms after the first are multiples of 60. - _Marc Morgenegg_, Apr 19 2016
%H A076504 Harvey P. Dale, <a href="/A076504/b076504.txt">Table of n, a(n) for n = 1..1000</a>
%F A076504 a(n) = 2*A066388(n).
%t A076504 Select[Mean /@ Select[Partition[Prime[Range[30000]], 2, 1], Last[#] - First[#] == 2 &], And @@ PrimeQ[#/2 + {1, -1}] &] (* _Harvey P. Dale_, Jan 23 2014 *)
%Y A076504 Cf. A066388.
%K A076504 nonn
%O A076504 1,1
%A A076504 _Eric W. Weisstein_, Oct 15 2002
%E A076504 Definition corrected by _Jaroslav Krizek_, Apr 12 2009