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 A039285 #17 Jun 28 2021 04:34:18 %S A039285 15,28,40,53,65,76,77,79,80,85,95,103,115,133,138,141,142,144,148,153, %T A039285 165,178,190,201,202,204,205,210,220,228,240,258,263,266,267,269,273, %U A039285 278,290,303,315,326,327,329,330,335,345,353,365,378,381,382,384,386 %N A039285 Numbers whose base-5 representation has the same nonzero number of 0's and 3's. %H A039285 Vincenzo Librandi, <a href="/A039285/b039285.txt">Table of n, a(n) for n = 1..1000</a> %t A039285 Select[Range[400],DigitCount[#,5,0]==DigitCount[#,5,3]>0&] (* _Harvey P. Dale_, Apr 18 2014 *) %Y A039285 Cf. A007091. %K A039285 nonn,base,easy %O A039285 1,1 %A A039285 _Olivier Gérard_