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%I #11 May 27 2023 20:37:39
%S 255,511,767,895,959,991,1007,1015,1019,1021,1022,1535,1791,1919,1983,
%T 2015,2031,2039,2043,2045,2046,2559,2815,2943,3007,3039,3055,3063,
%U 3067,3069,3070,3455,3519,3551,3567,3575,3579,3581
%N Numbers whose base-4 representation contains no 0's and exactly four 3's.
%t Select[Range[4500],DigitCount[#,4,0]==0 && DigitCount[#,4,3]==4&] (* _Harvey P. Dale_, Mar 18 2011 *)
%Y Cf. A007090.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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