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%I #9 May 07 2019 23:13:49
%S 1,3,6,10,12,15,17,20,24,26,29,32,34,37,41,43,46,50,52,55,58,60,63,67,
%T 69,72,74,77,81,83,86,89,91,94,98,100,103,105,108,112,114,117,120,122,
%U 125,129,131,134,138,140,143,146,148,151,155,157,160,162,165
%N Indices of 2's in A305389.
%H Robert Israel, <a href="/A316325/b316325.txt">Table of n, a(n) for n = 1..10000</a>
%p f:= 'f':
%p f(1):= 2: f(2):= 3: f(3):= (1,2,3):
%p S:= [1];
%p for i from 1 to 5 do T:= map(f,S); U:= map(f,T); S:= map(f,U); od:
%p select(t -> S[t+1]=2, [$0..nops(S)-1]); # _Robert Israel_, May 07 2019
%Y Cf. A305389.
%Y A316324, A316325, A316326 have the same relation to A305389 as A003144, A003145, A003146 do to the ternary tribonacci word A080843 (or A092782).
%K nonn
%O 1,2
%A _N. J. A. Sloane_, Jul 09 2018
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