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 A051817 #4 Jun 11 2014 17:24:22
%S A051817 1,14,198,2124,20894,208420,2117454,21576952,218613631,2195038525,
%T A051817 21848423462,216219614463,2135812278843,21121667130245,
%U A051817 209377570378397,2080106337706143
%N A051817 Number of n-digit numbers with nonzero multiplicative digital root 6.
%D A051817 William Mayne, sci.math, Jun 15 1991
%F A051817 # { i : 10^(n-1) < i < 10^n and A051802(i)=6 }
%Y A051817 Cf. A051802, A051808, A051826.
%K A051817 nonn,base,hard
%O A051817 1,2
%A A051817 _Dan Hoey_, Dec 09 1999