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 A190594 #10 Jul 19 2020 04:24:30
%S A190594 0,1,2,3,4,1,1,2,3,4,2,2,2,3,4,3,3,3,3,4,4,4,4,4,4,1,1,2,3,4,1,1,2,3,
%T A190594 4,2,2,2,3,4,3,3,3,3,4,4,4,4,4,4,2,2,2,3,4,2,2,2,3,4,2,2,2,3,4,3,3,3,
%U A190594 3,4,4,4,4,4,4,3,3,3,3,4,3,3,3,3,4,3,3,3,3,4,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4
%N A190594 Maximal digit in base-5 expansion of n.
%t A190594 Table[Max[IntegerDigits[n,5]],{n,0,120}] (* _Harvey P. Dale_, Nov 20 2012 *)
%o A190594 (PARI) a(n) = if (n, vecmax(digits(n, 5)), 0); \\ _Michel Marcus_, Jul 19 2020
%Y A190594 Cf. A007091, A054055.
%K A190594 base,nonn
%O A190594 0,3
%A A190594 _N. J. A. Sloane_, May 13 2011