A045080 - OEIS

%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_