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A045111 Numbers whose base-4 representation contains no 1's and exactly two 3's. 0

%I #13 May 21 2023 12:28:09

%S 15,47,51,59,60,62,143,175,179,187,188,190,195,203,204,206,227,235,

%T 236,238,240,242,248,250,527,559,563,571,572,574,655,687,691,699,700,

%U 702,707,715,716,718,739,747,748,750,752,754,760

%N Numbers whose base-4 representation contains no 1's and exactly two 3's.

%t Select[Range[1000],DigitCount[#,4,1]==0&&DigitCount[#,4,3]==2&] (* _Harvey P. Dale_, May 06 2013 *)

%Y Cf. A007090.

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified May 30 06:59 EDT 2024. Contains 372962 sequences. (Running on oeis4.)