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 A168063 #19 Mar 08 2022 12:05:43
%S A168063 1,3,5,6,9,12,15,18,21,30,39,42,45,60,69,72,81,99,102,105,108,111,129,
%T A168063 138,150,165,180,192,195,198,225,228,231,240,270,279,282,309,312,315,
%U A168063 348,351,381,399,420,432,441,459,462,465,489,501,522,570,600,615,618
%N A168063 Numbers k such that exactly two of {k-2, k-1, k+1, k+2} are primes.
%C A168063 Essentially the same as A014574 U A087679. - _Charles R Greathouse IV_, May 25 2011
%H A168063 G. C. Greubel, <a href="/A168063/b168063.txt">Table of n, a(n) for n = 1..1000</a>
%t A168063 Select[Range[700],Count[#+{-2,-1,1,2},_?PrimeQ]==2&] (* _Harvey P. Dale_, Jan 24 2014 *)
%Y A168063 Cf. A014574, A087679.
%K A168063 nonn,easy
%O A168063 1,2
%A A168063 _Juri-Stepan Gerasimov_, Nov 18 2009
%E A168063 Corrected (105 inserted, 609 removed) by _R. J. Mathar_, Jun 04 2010