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 A072803 #6 Oct 29 2024 23:23:59
%S A072803 1,10,10,10,10,10,10,10,10,0,11111111111,1100,111,32,30,24,23,22,21,0,
%T A072803 111111111111111111111,10110,212,120,100,42,36,34,32,0,
%U A072803 1111111111111111111111111111111,100000,1020,202,120,100,52,46,43,0
%N A072803 a(n) is n written in base n mod 10, or 0 if n mod 10 = 0.
%e A072803 In base 1, n =11...11=n written n times; in base 0 baseform is taken as 0.
%t A072803 Table[BaseForm[w, Mod[w, 10]], {w, 1, 128}]
%Y A072803 Cf. A008713, A072804-A072807.
%K A072803 base,nonn
%O A072803 1,2
%A A072803 _Labos Elemer_, Jul 12 2002