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%I #10 Oct 07 2020 08:01:42
%S 2,3,5,7,10,11,14,15,17,19,22,23,26,27,29,32,33,35,37,40,41,44,45,47,
%T 50,51,53,55,58,59,62,63,65,68,69,71,74,75,77,79,82,83,86,87,89,91,94,
%U 95,98,99,101,104,105,107,110,111,113,115,118,119,122,123
%N Positions of 1 in A285255; complement of A285256.
%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="/A285257/b285257.txt">Table of n, a(n) for n = 1..10000</a>
%e As a word, A285255 = 011010..., in which 0 is in positions 1,4,6,8,9,...
%t s = Nest[Flatten[# /. {0 -> {1, 0}, 1 -> {0, 1, 1, 0}}] &, {0}, 12]; (* A285255 *)
%t Flatten[Position[s, 0]]; (* A285256 *)
%t Flatten[Position[s, 1]]; (* A285257 *)
%Y Cf. A285250, A285255, A285256, A285258.
%K nonn,easy
%O 1,1
%A _Clark Kimberling_, Apr 24 2017
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