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%I #4 Jun 01 2017 21:09:19
%S 1,6,11,16,20,21,26,31,35,40,41,46,50,55,60,61,66,71,76,77,81,86,91,
%T 96,100,101,106,111,115,120,121,126,131,136,137,142,146,151,156,157,
%U 161,166,171,176,180,181,186,191,196,197,202,207,211,216,217,222,226
%N Positions of 0 in A287576.
%C a(n) - a(n-1) is in {1,4,5} for n >= 1; also, 4n - a(n) is in {0,1,2,3} for n >= 1. The first 20 numbers 4n - a(n) are 3, 2, 1, 0, 0, 3, 2, 1, 1, 0, 3, 2, 2, 1, 0, 3, 2, 1, 0, 3, with
%C 0 in positions given by A287578,
%C 1 in positions given by A287579,
%C 2 in positions given by A287580,
%C 3 in positions given by A287577.
%H Clark Kimberling, <a href="/A287577/b287577.txt">Table of n, a(n) for n = 1..10000</a>
%t s = Nest[Flatten[# /. {0 -> {0,3,2,1}, 1 -> {3,2,1,0}, 2 -> {2,1,0,3}, 3 -> {1,0,3,2}}] &, {0}, 9]; (* A287576 *)
%t Flatten[Position[s, 0]]; (* A287577 *)
%t Flatten[Position[s, 1]]; (* A287578 *)
%t Flatten[Position[s, 2]]; (* A287579 *)
%t Flatten[Position[s, 3]]; (* A287580 *)
%Y Cf. A287576, A287578, A287579, A287580.
%K nonn,easy
%O 1,2
%A _Clark Kimberling_, Jun 01 2017
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