A316325 Indices of 2's in A305389.

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

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