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A045130 Numbers whose base-4 representation contains exactly four 1's and one 3. 0

%I #14 May 21 2023 12:25:49

%S 343,349,373,469,853,1111,1117,1141,1237,1303,1309,1333,1351,1357,

%T 1363,1371,1372,1374,1383,1389,1393,1396,1398,1401,1431,1437,1461,

%U 1477,1489,1492,1494,1497,1509,1623,1629,1653,1749

%N Numbers whose base-4 representation contains exactly four 1's and one 3.

%t Select[Range[1800],DigitCount[#,4,1]==4&&DigitCount[#,4,3]==1&] (* _Harvey P. Dale_, Dec 17 2021 *)

%Y Cf. A007090.

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified May 21 12:09 EDT 2024. Contains 372736 sequences. (Running on oeis4.)