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

343, 349, 373, 469, 853, 1111, 1117, 1141, 1237, 1303, 1309, 1333, 1351, 1357, 1363, 1371, 1372, 1374, 1383, 1389, 1393, 1396, 1398, 1401, 1431, 1437, 1461, 1477, 1489, 1492, 1494, 1497, 1509, 1623, 1629, 1653, 1749

Offset

1,1

Links

Table of n, a(n) for n=1..37.

Mathematica

Select[Range[1800], DigitCount[#, 4, 1]==4&&DigitCount[#, 4, 3]==1&] (* Harvey P. Dale, Dec 17 2021 *)

Crossrefs

Cf. A007090.

Sequence in context: A028681 A005072 A112821 * A045269 A043395 A336354

Adjacent sequences: A045127 A045128 A045129 * A045131 A045132 A045133

Keyword

nonn,base

Author

Clark Kimberling

Status

approved