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 A051823 #4 Jun 11 2014 17:24:23
%S A051823 1,8,48,288,1736,10366,63911,435756,3703209,40131451,482893994,
%T A051823 5700587521,63022146850,649554554509,6315823743218,59044525222412
%N A051823 Number of numbers below 10^n with nonzero multiplicative digital root 3.
%D A051823 William Mayne, sci.math, Jun 15 1991
%F A051823 # { i : 10^(n-1) < i < 10^n and A051802(i)=3 }
%Y A051823 Cf. A051802, A051805, A051814.
%K A051823 nonn,base,hard
%O A051823 1,2
%A A051823 _Dan Hoey_, Dec 09 1999