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 A116257 #2 Mar 30 2012 17:40:40 %S A116257 7,8217106,8030443878983905980, %T A116257 43467818511541680701794365325328847002050, %U A116257 56532181488458319298205634674671152997943 %N A116257 n times n+8 gives the concatenation of two numbers m and m-5. %e A116257 8217106 * 8217114 = 6752089//6752084, where // denotes %e A116257 concatenation. %Y A116257 Cf. A116126, A116244, A116256, A116258, A116270. %K A116257 nonn,base %O A116257 1,1 %A A116257 _Giovanni Resta_, Feb 06 2006