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A189728
Positions of 0 in A189727; complement of A189729.
11
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
MATHEMATICA
(See A189727 and A287401.)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Apr 26 2011
STATUS
approved