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%I #4 May 29 2017 23:58:35
%S 1,5,7,10,13,17,19,22,26,28,31,35,37,41,43,46,49,53,55,59,61,64,67,71,
%T 73,76,80,82,86,88,91,94,98,100,103,107,109,113,115,118,121,125,127,
%U 130,134,136,139,143,145,149,151,154,157,161,163,167,169,172,175
%N Positions of 0 in A287443.
%C a(n) - a(n-1) is in {2, 3, 4} for n >= 1; also, 3n - a(n) is in {1, 2} for n >= 1. The first 20 numbers 3n - a(n) are 2, 1, 2, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 1, 2, 2, 2, 1, 2, 1, with 1 in positions given by A287443.
%H Clark Kimberling, <a href="/A287444/b287444.txt">Table of n, a(n) for n = 1..10000</a>
%t s = Nest[Flatten[# /. {0->{0, 1, 2}, 1->{2, 0, 1}, 2->{0, 2, 1}}] &, {0}, 9]; (*A287443*)
%t Flatten[Position[s, 0]]; (*A287444*)
%t Flatten[Position[s, 1]]; (*A287445*)
%t Flatten[Position[s, 2]]; (*A287446*)
%Y Cf. A287443, A287445, A287446.
%K nonn,easy
%O 1,2
%A _Clark Kimberling_, May 26 2017
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