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 A116306 #2 Mar 30 2012 17:40:40 %S A116306 3349727,3922992,6077000,6650265,4076746044440402197, %T A116306 5923253955559597795,7713109680804038561,33652275100997044455421, %U A116306 66347724899002955544571,74261393963751156983420 %N A116306 n times n+9 gives the concatenation of two numbers m and m+2. %e A116306 6650265 * 6650274 = 4422608//4422610, where // denotes %e A116306 concatenation. %Y A116306 Cf. A116175, A116300, A116305, A116313. %K A116306 nonn,base %O A116306 1,1 %A A116306 _Giovanni Resta_, Feb 06 2006