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 A039052 #14 Jun 20 2021 15:14:23 %S A039052 1,2,4,5,6,7,9,10,12,13,14,15,17,18,20,21,22,23,24,33,34,36,37,38,39, %T A039052 41,42,44,45,46,47,49,50,52,53,54,55,57,58,60,61,62,63,67,73,74,76,77, %U A039052 78,79,81,82,84,85,86,87,88,97,98,100,101,102,103,105,106,108,109,110 %N A039052 Numbers whose base-8 representation has the same number of 0's and 3's. %H A039052 Daniel Starodubtsev, <a href="/A039052/b039052.txt">Table of n, a(n) for n = 1..10000</a> %t A039052 Select[Range[200],DigitCount[#,8,0]==DigitCount[#,8,3]&] (* _Harvey P. Dale_, Sep 25 2017 *) %Y A039052 Cf. A007094. %K A039052 nonn,base,easy %O A039052 1,2 %A A039052 _Olivier Gérard_