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%I #4 May 02 2017 10:50:48
%S 2,3,4,12,13,14,16,17,18,20,21,22,24,25,26,28,29,30,32,33,34,36,37,38,
%T 46,47,48,56,57,58,66,67,68,76,77,78,86,87,88,96,97,98,106,107,108,
%U 110,111,112,114,115,116,118,119,120,122,123,124,126,127,128,130
%N Positions of 0 in A285617; complement of A285619.
%C Conjecture: a(n)/n -> 2.
%H Clark Kimberling, <a href="/A285618/b285618.txt">Table of n, a(n) for n = 1..10000</a>
%e As a word, A285617 = 1000111111100010001001..., in which 0 is in positions 2,3,4,12,...
%t s = Nest[Flatten[# /. {0 -> {1, 1}, 1 -> {1, 0, 0, 0}}] &, {0}, 10] (* A285617 *)
%t Flatten[Position[s, 0]] (* A285618 *)
%t Flatten[Position[s, 1]] (* A285619 *)
%Y Cf. A285617, A285619.
%K nonn,easy
%O 1,1
%A _Clark Kimberling_, May 01 2017
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