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

Author

N. J. A. Sloane, Sep 13 2018

Keywords

• nonn
• base
• easy

Examples

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

Links

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

Crossrefs

This is the union of {3} and A004758.

Cf. A007088.

Programs

Mathematica

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