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%I #4 May 25 2017 17:53:47
%S 2,5,7,10,14,17,20,23,25,29,32,34,37,41,44,47,50,52,55,59,62,65,68,70,
%T 74,77,79,82,86,89,92,95,97,101,104,106,110,113,115,118,122,125,128,
%U 131,133,137,140,142,145,149,152,155,158,160,164,167,169,172,176
%N Positions of 1 in A287397.
%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 1, 1, 2, 2, 1, 1, 1, 1, 2, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2.
%H Clark Kimberling, <a href="/A287399/b287399.txt">Table of n, a(n) for n = 1..10000</a>
%t s = Nest[Flatten[# /. {0->{0, 1, 2}, 1->{2, 1, 0}, 2->{1, 0, 2}}] &, {0}, 9]; (*A287397*)
%t Flatten[Position[s, 0]]; (*A287398*)
%t Flatten[Position[s, 1]]; (*A287399*)
%t Flatten[Position[s, 2]]; (*A287400*)
%Y Cf. A287397, A287398, A287400.
%K nonn,easy
%O 1,1
%A _Clark Kimberling_, May 25 2017
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