%I #4 May 21 2017 21:30:03
%S 3,4,13,14,17,18,21,22,27,28,33,34,43,44,53,54,63,64,67,68,71,72,81,
%T 82,85,86,89,90,99,100,103,104,107,108,113,114,119,120,129,130,133,
%U 134,137,138,143,144,149,150,159,160,163,164,167,168,173,174,179,180
%N Positions of 2 in A287086.
%H Clark Kimberling, <a href="/A287089/b287089.txt">Table of n, a(n) for n = 1..10000</a>
%t s = Nest[Flatten[# /. {0 -> {0, 1}, 1 -> {2, 2}, 2 -> 0}] &, {0}, 10] (* A287086 *)
%t Flatten[Position[s, 0]] (* A287087 *)
%t Flatten[Position[s, 1]] (* A287088 *)
%t Flatten[Position[s, 2]] (* A287089 *)
%Y Cf. A287086, A287087, A287088.
%K nonn,easy
%O 1,1
%A _Clark Kimberling_, May 21 2017
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