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 A181614 #18 Oct 18 2014 09:26:41 %S A181614 0,0,0,0,0,0,0,0,0,0,25,0,24,3,1,6,23,0,2,0,0,7,5,0,22,6,0,4,1,0,3,21, %T A181614 5,5,2,0,20,3,4,0,4,0,1,26,0,3,19,0,2,0,3,25,26,0,9,2,2,18,24,0,25,1, %U A181614 0,23,8,4,1,24,1,0,17,0,23,22,2,7,24,3,16,0,0,23,22,0 %N A181614 a(n) = number of steps needed to reach a Harshad number when the map k->A062028(l) is iterated starting at n, or -1 if a Harshad number is never reached. %D A181614 Eric Angelini, Posting to Sequence Fans Mailing List, Sep 20 2010 %H A181614 Hans Havermann, <a href="http://chesswanks.com/seq/StepsToHarshad.txt">Steps to reach a Harshad</a> %Y A181614 Cf. A005349, A062028, A181664. %K A181614 nonn,base %O A181614 1,11 %A A181614 _N. J. A. Sloane_, Nov 18 2010 %E A181614 a(22) onward from _John W. Layman_, Nov 19 2010