A318934 Numbers whose binary expansion begins with exactly two 1's.

3, 6, 12, 13, 24, 25, 26, 27, 48, 49, 50, 51, 52, 53, 54, 55, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223

Offset

1,1

Links

Seiichi Manyama, Table of n, a(n) for n = 1..10000

Example

3 11
6 110
12 1100
13 1101
24 11000
25 11001
26 11010
27 11011
48 110000
49 110001
...

Mathematica

Join[{3}, Select[Range[4, 250], Take[IntegerDigits[#, 2], 3]=={1, 1, 0}&]] (* Harvey P. Dale, Oct 15 2022 *)

Crossrefs

This is the union of {3} and A004758.

Cf. A007088.

Sequence in context: A298879 A116625 A287560 * A062053 A274652 A339552

Adjacent sequences: A318931 A318932 A318933 * A318935 A318936 A318937

Keyword

nonn,base,easy

Author

N. J. A. Sloane, Sep 13 2018

Status

approved