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 A116355 #2 Mar 30 2012 17:40:41 %S A116355 44,48,32182682,32523192,67476800,67817310,35810391829060641485878662, %T A116355 41417330943216586236893607,58582669056783413763106385, %U A116355 64189608170939358514121330,87098712900990098712901285 %N A116355 n times n+9 gives the concatenation of two numbers m and m+9. %e A116355 67817310 * 67817319 = 45991881//45991890, where // denotes concatenation. %Y A116355 Cf. A116224, A116347, A116354. %K A116355 nonn,base %O A116355 1,1 %A A116355 _Giovanni Resta_, Feb 06 2006