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 A134240 #2 Mar 31 2012 10:22:05 %S A134240 79,127,163,331,379,397,439,487,499,541,673,701,739,757,769,787,907, %T A134240 937,947,967,977,991,1009,1103,1123,1163,1187,1213,1249,1367,1399, %U A134240 1523,1549,1567,1579,1597,1753,1801 %N A134240 Numbers which occur in A105399 but not in A126990. %Y A134240 Cf. A105399, A134196, A134197, A126990. %K A134240 nonn %O A134240 1,1 %A A134240 _Artur Jasinski_, Oct 15 2007