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 A169735 #2 Mar 30 2012 16:51:44 %S A169735 100,99,81,72,63,54,45,36,27,18,9,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, %T A169735 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, %U A169735 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 %N A169735 a(1) = 100; for n>1, a(n) = a(n-1) - digitsum(a(n-1)). %Y A169735 Cf. A169732, A169736. %K A169735 nonn,base %O A169735 1,1 %A A169735 _N. J. A. Sloane_, May 01 2010