Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #12 Jun 26 2021 20:29:30
%S 0,1,2,3,5,6,8,9,10,11,12,13,14,15,17,18,20,21,22,23,24,25,26,27,29,
%T 30,32,33,34,35,36,37,38,39,41,42,44,45,46,47,55,60,61,62,63,65,66,68,
%U 69,70,71,72,73,74,75,77,78,80,81,82,83,88,96,97,98,99,101,102,104
%N Numbers whose base-12 representation has the same number of 4's and 7's.
%t Select[Range[0,150],DigitCount[#,12,4]==DigitCount[#,12,7]&] (* _Harvey P. Dale_, Jul 22 2020 *)
%K nonn,base,easy
%O 1,3
%A _Olivier Gérard_