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%I #20 Apr 24 2021 01:59:42
%S 255,511,767,831,895,959,975,991,1007,1011,1015,1019,1020,1021,1022,
%T 1279,1535,1791,1855,1919,1983,1999,2015,2031,2035,2039,2043,2044,
%U 2045,2046,2303,2559,2815,2879,2943,3007,3023,3039
%N Numbers having four 3's in base 4.
%t Select[Range[3100],DigitCount[#,4,3]==4&] (* _Harvey P. Dale_, Jun 09 2017 *)
%Y Cf. A007090.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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