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%I #8 Oct 07 2020 08:02:29
%S 1,4,5,8,9,11,14,15,17,20,21,23,25,28,29,32,33,35,37,40,41,44,45,47,
%T 50,51,53,56,57,59,61,64,65,68,69,71,73,76,77,80,81,83,86,87,89,91,94,
%U 95,98,99,101,104,105,107,110,111,113,115,118,119,122,123,125
%N Positions of 1 in A285258; complement of A285259.
%C Conjecture: 2n - a(n) is in {0,1} for n>=1.
%C See the comments of A285250 for a proof of this conjecture. - _Michel Dekking_, Oct 07 2020
%H Clark Kimberling, <a href="/A285260/b285260.txt">Table of n, a(n) for n = 1..10000</a>
%e As a word, A285258 = 10011001101..., in which 1 is in positions 1,4,5,8,9,11,...
%t s = Nest[Flatten[# /. {0 -> {1, 0}, 1 -> {0, 1, 1, 0}}] &, {0}, 11]; (* A285258 *)
%t Flatten[Position[s, 0]]; (* A285259 *)
%t Flatten[Position[s, 1]]; (* A285260 *)
%Y Cf. A285250, A285255, A285258, A285259.
%K nonn,easy
%O 1,2
%A _Clark Kimberling_, Apr 24 2017
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