A045127 Numbers whose base-4 representation contains exactly three 1's and three 3's.

1407, 1503, 1527, 1533, 1887, 1911, 1917, 2007, 2013, 2037, 3423, 3447, 3453, 3543, 3549, 3573, 3927, 3933, 3957, 4053, 4479, 4575, 4599, 4605, 4959, 4983, 4989, 5079, 5085, 5109, 5247, 5343, 5367, 5373, 5439, 5567

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Mathematica

Select[Range[6000], DigitCount[#, 4, 1]==DigitCount[#, 4, 3]==3&] (* Harvey P. Dale, Nov 26 2023 *)

Crossrefs

Cf. A007090.

Sequence in context: A107522 A158764 A035863 * A210786 A187957 A235906

Adjacent sequences: A045124 A045125 A045126 * A045128 A045129 A045130

Keyword

nonn,base

Author

Clark Kimberling

Status

approved