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 A039008 #16 Jun 20 2021 16:17:35 %S A039008 1,3,4,6,8,9,10,16,18,19,21,23,24,27,31,33,34,35,41,43,44,46,48,49,51, %T A039008 53,54,55,65,70,77,81,83,84,85,91,93,94,96,98,99,102,106,108,109,110, %U A039008 116,118,119,121,123,124,132,136,138,139,142,147,152,156,158,159,160 %N A039008 Numbers whose base-5 representation has the same number of 0's and 2's. %H A039008 Daniel Starodubtsev, <a href="/A039008/b039008.txt">Table of n, a(n) for n = 1..10000</a> %t A039008 Select[Range[180],DigitCount[#,5,0]==DigitCount[#,5,2]&] (* _Harvey P. Dale_, May 02 2011 *) %Y A039008 Cf. A007091. %K A039008 nonn,base,easy %O A039008 1,2 %A A039008 _Olivier Gérard_