A316326 Indices of 3's in A305389.

2, 4, 7, 8, 11, 13, 16, 18, 21, 22, 25, 27, 30, 33, 35, 38, 39, 42, 44, 47, 48, 51, 53, 56, 59, 61, 64, 65, 68, 70, 73, 75, 78, 79, 82, 84, 87, 90, 92, 95, 96, 99, 101, 104, 106, 109, 110, 113, 115, 118, 121, 123, 126, 127, 130, 132, 135, 136, 139, 141, 144, 147, 149, 152, 153, 156, 158, 161, 163, 166, 167, 170, 172

Offset

1,1

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]=3, [$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: A187834 A261619 A187575 * A074204 A030355 A288307

Adjacent sequences: A316323 A316324 A316325 * A316327 A316328 A316329

Keyword

nonn

Author

N. J. A. Sloane, Jul 09 2018

Status

approved