A045105 Numbers whose base-4 representation contains exactly four 1's and no 2's.

85, 277, 325, 337, 340, 343, 349, 373, 469, 853, 1045, 1093, 1105, 1108, 1111, 1117, 1141, 1237, 1285, 1297, 1300, 1303, 1309, 1333, 1345, 1348, 1351, 1357, 1360, 1363, 1372, 1375, 1393, 1396, 1399, 1405, 1477, 1489, 1492

Offset

1,1

Links

Table of n, a(n) for n=1..39.

Mathematica

Select[Range[1500], DigitCount[#, 4, 1]==4&&DigitCount[#, 4, 2]==0&] (* Harvey P. Dale, Aug 27 2023 *)

Crossrefs

Cf. A007090.

Sequence in context: A027524 A043340 A045129 * A038472 A020200 A020298

Adjacent sequences: A045102 A045103 A045104 * A045106 A045107 A045108

Keyword

nonn,base

Author

Clark Kimberling

Status

approved