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 A116312 #2 Mar 30 2012 17:40:40 %S A116312 72,3255,6738,9752,80647887029795095027968358511096470120, %T A116312 85938613861405938604061385940594061403, %U A116312 88568679109003015820047566431888549328 %N A116312 n times n+8 gives the concatenation of two numbers m and m+3. %e A116312 9752 * 9760 = 9517//9520, where // denotes concatenation. %Y A116312 Cf. A116181, A116305, A116311, A116313, A116320. %K A116312 nonn,base %O A116312 1,1 %A A116312 _Giovanni Resta_, Feb 06 2006