A032937 Numbers k whose base-2 representation Sum_{i=0..m} d(i)*2^(m-i) has d(i)=0 for all odd i, excluding 0. Here m is the position of the leading bit of k.

1, 2, 4, 5, 8, 10, 16, 17, 20, 21, 32, 34, 40, 42, 64, 65, 68, 69, 80, 81, 84, 85, 128, 130, 136, 138, 160, 162, 168, 170, 256, 257, 260, 261, 272, 273, 276, 277, 320, 321, 324, 325, 336, 337, 340, 341, 512, 514, 520, 522, 544, 546

Offset

1,2

Comments

Essentially the same as A126684. - R. J. Mathar, Jun 15 2008

A126684 is the primary entry for this sequence. - Franklin T. Adams-Watters, Aug 30 2014

Links

Table of n, a(n) for n=1..52.

Mathematica

Join[{1}, Select[Range[0, 600], Union[Take[IntegerDigits[#, 2], {2, -1, 2}]]=={0}&]] (* Harvey P. Dale, Sep 17 2023 *)

Crossrefs

Cf. A033053, A126684.

Sequence in context: A300351 A105425 A199799 * A126684 A089653 A180252

Adjacent sequences: A032934 A032935 A032936 * A032938 A032939 A032940

Keyword

nonn,base

Author

Clark Kimberling

Status

approved