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 A116225 #2 Mar 30 2012 17:40:40 %S A116225 12,878,969,4582271,5417729,7235911,7365332534826384966, %T A116225 8274423443917294057,3818527786666305707333509337803, %U A116225 6181472213333694292666490662197,7454891423029942070969872974167 %N A116225 n times n+1 gives the concatenation of two numbers m and m-9. %e A116225 7235911 * 7235912 = 5235841//5235832, where // denotes %e A116225 concatenation. %Y A116225 Cf. A116094, A116226, A116232. %K A116225 nonn,base %O A116225 1,1 %A A116225 _Giovanni Resta_, Feb 06 2006