%I #4 May 21 2017 14:35:02

%S 3,6,11,15,20,24,27,31,36,40,43,48,52,55,59,64,68,71,76,80,85,89,92,

%T 97,101,104,108,113,117,120,125,129,134,138,141,145,150,154,157,162,

%U 166,171,175,178,183,187,190,194,199,203,206,211,215,220,224,227,231

%N Positions of 2 in A287072.

%H Clark Kimberling, <a href="/A287075/b287075.txt">Table of n, a(n) for n = 1..10000</a>

%t s = Nest[Flatten[# /. {0 -> {0, 1}, 1 -> {2, 1}, 2 -> 0}] &, {0}, 10] (* A287072 *)

%t Flatten[Position[s, 0]] (* A287073 *)

%t Flatten[Position[s, 1]] (* A287074 *)

%t Flatten[Position[s, 2]] (* A287075 *)

%Y Cf. A287072, A287073, A287074.

%K nonn,easy

%O 1,1

%A _Clark Kimberling_, May 21 2017