%I #4 Apr 22 2017 23:04:27
%S 1,3,7,9,13,15,17,19,23,25,29,31,35,37,41,43,45,47,51,53,57,59,61,63,
%T 67,69,73,75,79,81,85,87,89,91,95,97,101,103,105,107,111,113,117,119,
%U 121,123,127,129,133,135,137,139,143,145,149,151,155,157,161,163
%N Positions of 1 in A285142; complement of A285143.
%C Conjecture: -1 < n*r - a(n) < sqrt(3) for n>=1, where r = 1 + sqrt(3).
%H Clark Kimberling, <a href="/A285144/b285144.txt">Table of n, a(n) for n = 1..10000</a>
%e As a word, A285142 = 1010001010..., in which 1 is in positions 1,3,7,9,13,...
%t s = Nest[Flatten[# /. {0 -> {1, 0}, 1 -> {0, 0, 1, 0}}] &, {0}, 11]; (* A285142 *)
%t Flatten[Position[s, 0]]; (* A285143 *)
%t Flatten[Position[s, 1]]; (* A285144 *)
%Y Cf. A285139, A285142, A285143.
%K nonn,easy
%O 1,2
%A _Clark Kimberling_, Apr 21 2017
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