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 A072216 #9 Mar 30 2012 16:49:29 %S A072216 5,89,187,1297,10911,150296,9008299,15002893,140669390,1005499526, %T A072216 10087799570 %N A072216 Consider the Reverse and Add! problem (cf. A001127); of all the n-digit numbers N which eventually reach a palindrome, pick that number N which takes the greatest number of steps to converge (in case of a tie, pick the smallest N); sequence gives values of N. %C A072216 Since we do not even know if 196 eventually converges (see A006960, A023108) for n >= 3 these values are only conjectures. %H A072216 Jason Doucette, <a href="http://www.jasondoucette.com/worldrecords.html">World records</a> %H A072216 <a href="/index/Res#RAA">Index entries for sequences related to Reverse and Add!</a> %Y A072216 Cf. A072217, A072218, A001127, A006960, A023108. %K A072216 nonn,hard,base %O A072216 1,1 %A A072216 _N. J. A. Sloane_, Jul 05 2002 %E A072216 Corrected and extended by Jason Doucette, May 20 2003; Oct 09 2005