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 A072715 #7 Mar 30 2012 18:39:04 %S A072715 1,4,8,12,18,24,26,34,38,42,48,52,60,64,66,78,80,90,96,102,108,114, %T A072715 116,134,138,148,156,162,168,180,198,200,208,216,220,230,236,242,252, %U A072715 264,266,280,294,312,324,330,336,342,344,350,370,378,390,394,408,420,426 %N A072715 Record differences between n-th prime and 2n-th prime. %H A072715 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a> %Y A072715 RECORDS transform of A072473. %K A072715 nonn %O A072715 1,2 %A A072715 _Benoit Cloitre_, Aug 07 2002