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 A152231 #8 Jan 09 2015 19:25:53 %S A152231 2,4,10,17,32,52,79,122,170,226,292,371,461,562,676,809,959,1132,1312, %T A152231 1499,1709,1936,2182,2441,2711,2992,3295,3617,3956,4318,4696,5099, %U A152231 5525,5968,6439,6932,7445,7978,8542,9125,9725,10348,10987,11651,12329,13024 %N A152231 Similar to A072921 but starting with 2. %H A152231 Alois P. Heinz, <a href="/A152231/b152231.txt">Table of n, a(n) for n = 1..1000</a> %p A152231 b:= proc(n) option remember; local m; m:= a(n); `if`(n=1, 0, b(n-1)); while m>0 do %+ irem(m, 10, 'm') od; % end: a:= proc(n) option remember; `if`(n=1, 2, a(n-1) +b(n-1)) end: seq(a(n), n=1..50); # _Alois P. Heinz_, Oct 07 2009 %K A152231 nonn,base,easy %O A152231 1,1 %A A152231 _N. J. A. Sloane_, Oct 07 2009