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 A043532 #12 Apr 24 2021 21:25:31 %S A043532 1,1,1,1,2,1,2,2,2,2,2,1,2,2,2,2,2,1,2,2,2,2,2,1,2,2,3,3,3,2,1,2,2,2, %T A043532 3,2,2,3,3,3,2,3,2,3,3,2,3,3,2,2,3,2,3,3,3,2,2,3,3,2,2,1,2,2,3,3,2,2, %U A043532 3,3,3,2,3,2,2,3,3,2,3,3,2,3,2,3,3,3,2,2,3,2 %N A043532 Number of distinct base-5 digits of n. %t A043532 f[n_]:=Length[Select[DigitCount[n,5],#!=0&]]; Array[f,100] (* _Harvey P. Dale_, May 11 2011 *) %Y A043532 Cf. A007091. %K A043532 nonn,base %O A043532 1,5 %A A043532 _Clark Kimberling_