A045123 Numbers whose base-4 representation contains exactly two 1's and four 3's.

1535, 1919, 2015, 2039, 2045, 3455, 3551, 3575, 3581, 3935, 3959, 3965, 4055, 4061, 4085, 4607, 4991, 5087, 5111, 5117, 5375, 5887, 5951, 6079, 6095, 6127, 6131, 6139, 6140, 6142, 6655, 7039, 7135, 7159, 7165, 7295

Offset

1,1

Links

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

Mathematica

Select[Range[8000], DigitCount[#, 4, 1]==2&&DigitCount[#, 4, 3]==4&] (* Harvey P. Dale, Jan 31 2015 *)

Crossrefs

Cf. A007090.

Sequence in context: A145982 A251891 A088362 * A252419 A179692 A105923

Adjacent sequences: A045120 A045121 A045122 * A045124 A045125 A045126

Keyword

nonn,base

Author

Clark Kimberling

Status

approved