A045131 Numbers whose base-4 representation contains exactly four 1's and two 3's.

1375, 1399, 1405, 1495, 1501, 1525, 1879, 1885, 1909, 2005, 3415, 3421, 3445, 3541, 3925, 4447, 4471, 4477, 4567, 4573, 4597, 4951, 4957, 4981, 5077, 5215, 5239, 5245, 5335, 5341, 5365, 5407, 5431, 5437, 5455, 5487

Offset

1,1

Links

Table of n, a(n) for n=1..36.

Crossrefs

Cf. A007090.

Sequence in context: A239974 A258964 A349235 * A365868 A056049 A206340

Adjacent sequences: A045128 A045129 A045130 * A045132 A045133 A045134

Keyword

nonn,base

Author

Clark Kimberling

Status

approved