login
A285210
Positions of 1 in A285208; complement of A285209.
3
1, 4, 7, 9, 12, 15, 18, 21, 23, 26, 29, 31, 34, 37, 40, 43, 45, 48, 51, 53, 56, 59, 61, 64, 67, 69, 72, 75, 78, 81, 83, 86, 89, 91, 94, 97, 100, 103, 105, 108, 111, 113, 116, 119, 122, 125, 127, 130, 133, 135, 138, 141, 144, 147, 149, 152, 155, 157, 160, 163
OFFSET
1,2
COMMENTS
Conjecture: 0 < n*r - a(n) < 3, where r = 1 + sqrt(3).
LINKS
EXAMPLE
As a word, A285205 = 1001001010..., in which 1 is in positions 1,4,7,9,12,...
MATHEMATICA
s = Nest[Flatten[# /. {0 -> {1, 0}, 1 -> {0, 1, 0, 0}}] &, {0}, 11]; (* A285208 *)
Flatten[Position[s, 0]]; (* A285209 *)
Flatten[Position[s, 1]]; (* A285210 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Apr 23 2017
STATUS
approved