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 A039356 #13 Jun 30 2021 01:55:51 %S A039356 55,62,119,126,183,190,247,254,311,318,375,382,391,399,407,415,423, %T A039356 431,440,441,442,443,444,445,454,462,470,478,486,494,496,497,498,499, %U A039356 500,501,567,574,631,638,695,702,759,766,823,830,887,894,903,911,919 %N A039356 Numbers whose base-8 representation has the same nonzero number of 6's and 7's. %H A039356 Harvey P. Dale, <a href="/A039356/b039356.txt">Table of n, a(n) for n = 1..1000</a> %t A039356 Select[Range[1000],DigitCount[#,8,6]==DigitCount[#,8,7]>0&] (* _Harvey P. Dale_, Jun 01 2012 *) %Y A039356 Cf. A007094. %K A039356 nonn,base,easy %O A039356 1,1 %A A039356 _Olivier Gérard_