%I #11 Apr 24 2021 20:45:58
%S 2460,9021,15582,19956,20685,21414,21900,21981,22062,22116,22125,
%T 22134,22140,22141,22142,22144,22145,22146,22147,22148,22152,22161,
%U 22170,22179,22188,22224,22305,22386,22467,22548,22872
%N Numbers having four 3's in base 9.
%t Select[Range[23000],DigitCount[#,9,3]==4&] (* _Harvey P. Dale_, Feb 19 2011 *)
%Y Cf. A007095.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
|