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 A116342 #2 Mar 30 2012 17:40:40 %S A116342 4415,5577,7840,3188375836088211088457055570, %T A116342 4940200653606459263639537322,5059799346393540736360462670, %U A116342 6811624163911788911542944422,6977607565571622928141284588 %N A116342 n times n+9 gives the concatenation of two numbers m and m+7. %e A116342 7840 * 7849 = 6153//6160, where // denotes concatenation. %Y A116342 Cf. A116211, A116334, A116341, A116347. %K A116342 nonn,base %O A116342 1,1 %A A116342 _Giovanni Resta_, Feb 06 2006