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A045109 Numbers whose base-4 representation contains exactly four 1's and four 2's. 0

%I #13 May 14 2023 04:11:21

%S 21930,22122,22170,22182,22185,22890,22938,22950,22953,23130,23142,

%T 23145,23190,23193,23205,25962,26010,26022,26025,26202,26214,26217,

%U 26262,26265,26277,26970,26982,26985,27030,27033

%N Numbers whose base-4 representation contains exactly four 1's and four 2's.

%t Select[Range[27200],DigitCount[#,4,1]==DigitCount[#,4,2]==4&] (* _Harvey P. Dale_, Jul 19 2019 *)

%Y Cf. A007090.

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified April 14 16:12 EDT 2024. Contains 371665 sequences. (Running on oeis4.)