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 A038013 #3 Mar 30 2012 17:37:06 %S A038013 843,3903,4743,6243,6543,8403,8463,8673,9243,11283,11583,11823,13023, %T A038013 14343,14503,15123,15543,16203,17043,17143,17163,18183,18423,18783, %U A038013 18843,18903,19383,20223,21783,22203,23523,23943 %N A038013 Values of A038005 ending in 3. %Y A038013 Cf. A038014. %K A038013 nonn,base %O A038013 0,1 %A A038013 _Christian G. Bower_