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 A039351 #16 Jun 30 2021 01:56:06 %S A039351 37,44,101,108,165,172,229,236,261,269,277,285,296,297,298,299,302, %T A039351 303,309,317,324,332,340,348,352,353,354,355,358,359,372,380,421,428, %U A039351 485,492,549,556,613,620,677,684,741,748,773,781,789,797,808,809,810 %N A039351 Numbers whose base-8 representation has the same nonzero number of 4's and 5's. %H A039351 Vincenzo Librandi, <a href="/A039351/b039351.txt">Table of n, a(n) for n = 1..1000</a> %t A039351 Select[Range[900],DigitCount[#,8,4]==DigitCount[#,8,5]>0&] (* _Harvey P. Dale_, Oct 03 2013 *) %Y A039351 Cf. A007094. %K A039351 nonn,base,easy %O A039351 1,1 %A A039351 _Olivier Gérard_