|
%I #4 May 30 2017 12:15:23
%S 3,4,8,11,15,16,19,23,27,28,32,36,39,40,44,47,51,52,56,60,61,64,68,72,
%T 75,76,80,83,87,88,91,95,99,102,103,107,111,112,116,119,123,124,127,
%U 131,135,136,140,144,147,148,152,155,159,160,163,167,171,174,175
%N Positions of 2 in A287451.
%C a(n) - a(n-1) is in {1, 3, 4} for n >= 1; also, 3n - a(n) is in {0, 1, 2} for n >= 1. The first 20 numbers 3n - a(n) are 0, 2, 1, 1, 0, 2, 2, 1, 0, 2, 1, 0, 0, 2, 1, 1, 0, 2, 1, 0, with 0 in positions given by A287452, 1 in positions given by A287454, and 2 in positions given by A287453.
%H Clark Kimberling, <a href="/A287454/b287454.txt">Table of n, a(n) for n = 1..10000</a>
%t s = Nest[Flatten[# /. {0->{0, 1, 2}, 1->{2, 0, 1}, 2->{1, 2, 0}}] &, {0}, 9]; (*A287451*)
%t Flatten[Position[s, 0]]; (*A287452*)
%t Flatten[Position[s, 1]]; (*A287453*)
%t Flatten[Position[s, 2]]; (*A287454*)
%Y Cf. A287451, A287452, A287453.
%K nonn,easy
%O 1,1
%A _Clark Kimberling_, May 30 2017
|
