A045126 Numbers whose base-4 representation contains exactly three 1's and two 3's.

351, 375, 381, 471, 477, 501, 855, 861, 885, 981, 1119, 1143, 1149, 1239, 1245, 1269, 1311, 1335, 1341, 1359, 1391, 1395, 1403, 1404, 1406, 1439, 1463, 1469, 1479, 1485, 1491, 1499, 1500, 1502, 1511, 1517, 1521, 1524

Offset

1,1

Links

Table of n, a(n) for n=1..38.

Mathematica

Select[Range[1600], DigitCount[#, 4, 1]==3&&DigitCount[#, 4, 3]==2&] (* Harvey P. Dale, Jun 20 2017 *)

Crossrefs

Cf. A007090.

Sequence in context: A084875 A364508 A074203 * A025385 A261640 A292990

Adjacent sequences: A045123 A045124 A045125 * A045127 A045128 A045129

Keyword

nonn,base

Author

Clark Kimberling

Status

approved