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%I #21 Sep 17 2023 14:57:14
%S 1,2,4,5,8,10,16,17,20,21,32,34,40,42,64,65,68,69,80,81,84,85,128,130,
%T 136,138,160,162,168,170,256,257,260,261,272,273,276,277,320,321,324,
%U 325,336,337,340,341,512,514,520,522,544,546
%N 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.
%C Essentially the same as A126684. - _R. J. Mathar_, Jun 15 2008
%C A126684 is the primary entry for this sequence. - _Franklin T. Adams-Watters_, Aug 30 2014
%t Join[{1},Select[Range[0,600],Union[Take[IntegerDigits[#,2],{2,-1,2}]]=={0}&]] (* _Harvey P. Dale_, Sep 17 2023 *)
%Y Cf. A033053, A126684.
%K nonn,base
%O 1,2
%A _Clark Kimberling_
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