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Numbers whose base-4 representation contains exactly four 2's and four 3's.
0

%I #14 May 21 2023 11:05:23

%S 43775,43967,44015,44027,44030,44735,44783,44795,44798,44975,44987,

%T 44990,45035,45038,45050,47807,47855,47867,47870,48047,48059,48062,

%U 48107,48110,48122,48815,48827,48830,48875,48878

%N Numbers whose base-4 representation contains exactly four 2's and four 3's.

%t Select[Range[50000],Rest[Most[DigitCount[#,4]]]=={4,4}&] (* _Harvey P. Dale_, Feb 05 2011 *)

%Y Cf. A007090.

%K nonn,base

%O 1,1

%A _Clark Kimberling_