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 A039155 #15 Jun 26 2021 01:52:51 %S A039155 0,1,2,3,4,5,6,7,10,11,12,13,14,15,16,17,20,21,22,23,24,25,26,27,30, %T A039155 31,32,33,34,35,36,37,40,41,42,43,44,45,46,47,50,51,52,53,54,55,56,57, %U A039155 60,61,62,63,64,65,66,67,70,71,72,73,74,75,76,77,89,98,100,101,102 %N A039155 Numbers whose base-10 representation has the same number of 8's and 9's. %t A039155 Select[Range[0,110], DigitCount[#,10,8] == DigitCount[#,10,9]&] (* _Harvey P. Dale_, Jan 13 2013 *) %K A039155 nonn,base,easy %O A039155 1,3 %A A039155 _Olivier Gérard_