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 A116230 #2 Mar 30 2012 17:40:40 %S A116230 80,77394226,89158932,36623663376237623663376334, %T A116230 37633762366336633762366234,62366237633663366237633760, %U A116230 63376336623762376336623660,86194223018927804587702127 %N A116230 n times n+7 gives the concatenation of two numbers m and m-9. %e A116230 89158932 * 89158939 = 79493157//79493148, where // denotes %e A116230 concatenation. %Y A116230 Cf. A116099, A116229, A116231, A116238. %K A116230 nonn,base %O A116230 1,1 %A A116230 _Giovanni Resta_, Feb 06 2006