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 A268109 #7 Feb 03 2016 16:07:24 %S A268109 2,3,5,7,11,13,17,19,23,29,31,41,647,1277,1979,2753 %N A268109 Terms of A268101 without repetition. %Y A268109 Cf. A268101. Supersequence of A014556. %K A268109 nonn,hard,more %O A268109 1,1 %A A268109 _Arkadiusz Wesolowski_, Jan 26 2016