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 A316325 Indices of 2's in A305389. 5
 1, 3, 6, 10, 12, 15, 17, 20, 24, 26, 29, 32, 34, 37, 41, 43, 46, 50, 52, 55, 58, 60, 63, 67, 69, 72, 74, 77, 81, 83, 86, 89, 91, 94, 98, 100, 103, 105, 108, 112, 114, 117, 120, 122, 125, 129, 131, 134, 138, 140, 143, 146, 148, 151, 155, 157, 160, 162, 165 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 MAPLE f:= 'f': f(1):= 2: f(2):= 3: f(3):= (1, 2, 3): S:= [1]; for i from 1 to 5 do T:= map(f, S); U:= map(f, T); S:= map(f, U); od: select(t -> S[t+1]=2, [\$0..nops(S)-1]); # Robert Israel, May 07 2019 CROSSREFS Cf. A305389. A316324, A316325, A316326 have the same relation to A305389 as A003144, A003145, A003146 do to the ternary tribonacci word A080843 (or A092782). Sequence in context: A301285 A310042 A310043 * A114981 A319452 A187744 Adjacent sequences:  A316322 A316323 A316324 * A316326 A316327 A316328 KEYWORD nonn AUTHOR N. J. A. Sloane, Jul 09 2018 STATUS approved

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Last modified February 22 13:51 EST 2020. Contains 332136 sequences. (Running on oeis4.)