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 A116251 #2 Mar 30 2012 17:40:40 %S A116251 8,74,7249,7934,86897,95988,7450775,8912862,3546363535354546354, %T A116251 4635454646463635464,5364545353536364536,6453636464645453646, %U A116251 31993591495513432827264,39229430087220380122376 %N A116251 n times n+1 gives the concatenation of two numbers m and m-5. %e A116251 8912862 * 8912863 = 7943911//7943906, where // denotes %e A116251 concatenation. %Y A116251 Cf. A116120, A116246, A116252, A116265. %K A116251 nonn,base %O A116251 1,1 %A A116251 _Giovanni Resta_, Feb 06 2006