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 A129887 #5 Mar 30 2012 16:50:41 %S A129887 98,72,77,49,54,20,25,10,15,5,10,0,5,5,10,0,5,5,10,0,10,0,5,5,10,0,5, %T A129887 5,10,0,10,0,5,5,10,0,5,5,10,0,10,0,5,5,10,0,5,5,10,0,10,0,5,5,10,0,5, %U A129887 5,10,0,10,0,5,5,10,0,5,5,10,0,10,0,5,5,10,0,5,5,10,0,10,0,5,5 %N A129887 Start with 98, then write down the product of its digits, then add 5; repeat. %K A129887 nonn,base %O A129887 1,1 %A A129887 _N. J. A. Sloane_, May 26 2007