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%I #10 May 24 2023 00:01:39
%S 12351,12495,12531,12540,13071,13107,13116,13251,13260,13296,15375,
%T 15411,15420,15555,15564,15600,16131,16140,16176,16320,16639,17215,
%U 17359,17395,17404,19519,19663,19699,19708,20239
%N Numbers whose base-4 representation contains exactly three 0's and four 3's.
%t Select[Range[25000],DigitCount[#,4,0]==3&&DigitCount[#,4,3]==4&] (* _Harvey P. Dale_, Jan 28 2013 *)
%Y Cf. A007090.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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