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%I #8 May 22 2017 07:13:14
%S 1,5,8,10,11,15,17,18,21,22,24,28,31,33,34,37,38,40,44,46,47,49,53,54,
%T 58,61,63,64,68,70,71,74,75,77,81,83,84,86,90,91,95,98,100,101,104,
%U 105,107,111,112,116,119,121,122,124,128,131,133,134,138,140,141
%N Positions of 1 in A287108.
%H Clark Kimberling, <a href="/A287110/b287110.txt">Table of n, a(n) for n = 1..10000</a>
%t s = Nest[Flatten[# /. {0 -> {1, 0}, 1 -> {2, 1}, 2 -> 0}] &, {0}, 10] (* A287108 *)
%t Flatten[Position[s, 0]] (* A287109 *)
%t Flatten[Position[s, 1]] (* A287110 *)
%t Flatten[Position[s, 2]] (* A287111 *)
%Y Cf. A287108, A287109, A287111.
%K nonn,easy
%O 1,2
%A _Clark Kimberling_, May 21 2017
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