A045132 Numbers whose base-4 representation contains exactly four 1's and three 3's.

5503, 5599, 5623, 5629, 5983, 6007, 6013, 6103, 6109, 6133, 7519, 7543, 7549, 7639, 7645, 7669, 8023, 8029, 8053, 8149, 13663, 13687, 13693, 13783, 13789, 13813, 14167, 14173, 14197, 14293, 15703, 15709, 15733, 15829

Offset

1,1

Links

Table of n, a(n) for n=1..34.

Mathematica

Select[Range[16000], DigitCount[#, 4, 1]==4&&DigitCount[#, 4, 3]==3&] (* Harvey P. Dale, May 25 2013 *)

Crossrefs

Cf. A007090.

Sequence in context: A252312 A247924 A031617 * A096702 A252621 A234561

Adjacent sequences: A045129 A045130 A045131 * A045133 A045134 A045135

Keyword

nonn,base

Author

Clark Kimberling

Status

approved