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A318934
Numbers whose binary expansion begins with exactly two 1's.
1
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
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
KEYWORD
nonn,base,easy
AUTHOR
N. J. A. Sloane, Sep 13 2018
STATUS
approved