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 A052256 #4 Oct 15 2013 22:30:33 %S A052256 7,19,17,13,11,13,17,13,19,7,7,13,11,7,23,11,7,11,7,11,11,7,19,37,31, %T A052256 7,7,17,7,13,43,23,43,7,17,37,41,7,43,41,23,17,13,11,7,13,19,11,61,13, %U A052256 7,19,13,67,7,31,31,29,11,7,41,7,11,37,29,11,7,13,13,7,11,61,7,7,67,29,7 %N A052256 Last filtering prime (A052180) of primes p such that next prime is p+8 (A031926). %Y A052256 A052180(A031926(n)). %K A052256 nonn,easy %O A052256 1,1 %A A052256 _Labos Elemer_, Feb 02 2000