A189728 Positions of 0 in A189727; complement of A189729.

1, 6, 9, 12, 15, 16, 21, 24, 25, 30, 33, 34, 39, 42, 43, 46, 51, 54, 57, 60, 61, 66, 69, 70, 73, 78, 81, 84, 87, 88, 93, 96, 97, 100, 105, 108, 111, 114, 115, 120, 123, 124, 127, 132, 135, 136, 141, 144, 147, 150, 151, 156, 159, 160, 165, 168, 169, 174, 177, 178, 181, 186, 189, 192, 195, 196, 201, 204, 205, 208, 213, 216, 217, 222, 225

Offset

1,2

Comments

See A189727.

This sequence also gives the positions of 0 in the fixed point of the morphism 0->012, 1->210, 2->120. Moreover, a(n) - a(n-1) is in {1,3,5} for n >= 1; also, 3n - a(n) is in {0, 2} for n >= 1. The first 20 numbers 3n - a(n) are 2, 0, 0, 0, 0, 2, 0, 0, 2, 0, 0, 2, 0, 0, 2, 2, 0, 0, 0, 0, with 2 in positions given by A189728. - Clark Kimberling, May 25 2017

Links

Clark Kimberling, Table of n, a(n) for n = 1..10000

Mathematica

(See A189727 and A287401.)

Crossrefs

Cf. A189727, A189729, A189730, A287401.

Sequence in context: A330703 A262828 A306647 * A214777 A239310 A130699

Adjacent sequences: A189725 A189726 A189727 * A189729 A189730 A189731

Keyword

nonn

Author

Clark Kimberling, Apr 26 2011

Status

approved