%I
%S 1,2,3,4,7,8,9,10,11,14,15,16,17,18,21,22,23,24,25,28,31,34,37,40,41,
%T 42,43,44,47,48,49,50,51,54,55,56,57,58,61,62,63,64,65,68,69,70,71,72,
%U 75,78,81,84,87,88,89,90,91,94,95,96,97,98,101,102,103
%N Positions of 1 in A285403; complement of A285404.
%H Clark Kimberling, <a href="/A285405/b285405.txt">Table of n, a(n) for n = 1..10000</a>
%e As a word, A285403 = 1111001..., in which 0 is in positions 1,2,3,4,7,8,...
%t s = Nest[Flatten[# /. {0 > {1, 1}, 1 > {0, 0, 1}}] &, {0}, 11] (* A285403 *)
%t Flatten[Position[s, 0]] (* A285404 *)
%t Flatten[Position[s, 1]] (* A285405 *)
%Y Cf. A285401, A285403, A285404.
%K nonn,easy
%O 1,2
%A _Clark Kimberling_, Apr 27 2017
