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%I #4 Apr 21 2017 08:05:39
%S 1,3,5,7,13,15,17,19,21,27,29,31,33,35,41,43,45,47,49,55,61,67,73,79,
%T 81,83,85,87,93,95,97,99,101,107,109,111,113,115,121,123,125,127,129,
%U 135,137,139,141,143,149,155,161,167,173,175,177,179,181,187,189
%N Positions of 1 in A285128; complement of A285139.
%C Conjecture: -1 < n*r - a(n) < 3 for n>=1, where r = 3.5621...
%H Clark Kimberling, <a href="/A285130/b285130.txt">Table of n, a(n) for n = 1..10000</a>
%e As a word, A285128 = 10101010000010..., in which 1 is in positions 1,3,5,7,13,...
%t s = Nest[Flatten[# /. {0 -> {1, 0}, 1 -> {0, 0, 0, 0}}] &, {0}, 14]; (* A285125 *)
%t Flatten[Position[s, 0]]; (* A285126 *)
%t Flatten[Position[s, 1]]; (* A285127 *)
%Y Cf. A285125, A285128, A285129.
%K nonn,easy
%O 1,2
%A _Clark Kimberling_, Apr 19 2017
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