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Positions of 0 in A287200.
4

%I #4 May 23 2017 21:00:07

%S 4,8,10,12,13,14,18,22,26,28,30,31,32,36,38,40,41,42,46,48,50,51,52,

%T 56,57,58,62,63,64,68,72,76,78,80,81,82,86,90,94,96,98,99,100,104,108,

%U 112,114,116,117,118,122,124,126,127,128,132,134,136,137,138

%N Positions of 0 in A287200.

%H Clark Kimberling, <a href="/A287201/b287201.txt">Table of n, a(n) for n = 1..10000</a>

%t s = Nest[Flatten[# /. {0 -> {1, 0}, 1 -> {2, 2}, 2 -> 0}] &, {0}, 11] (* A287200 *)

%t Flatten[Position[s, 0]] (* A287201 *)

%t Flatten[Position[s, 1]] (* A287202 *)

%t Flatten[Position[s, 2]] (* A287203 *)

%Y Cf. A287200, A287202, A287203.

%K nonn,easy

%O 1,1

%A _Clark Kimberling_, May 23 2017