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A286421
Positions of 1 in A286419; complement of A286420.
3
2, 3, 4, 5, 6, 9, 11, 12, 13, 14, 16, 17, 20, 21, 22, 23, 24, 27, 29, 30, 33, 34, 35, 36, 38, 39, 40, 41, 42, 45, 47, 48, 49, 50, 52, 53, 56, 57, 58, 59, 61, 62, 63, 64, 65, 68, 70, 71, 74, 75, 76, 77, 78, 81, 83, 84, 85, 86, 88, 89, 92, 93, 94, 95, 96, 99
OFFSET
1,1
COMMENTS
a(n) - a(n-1) is in {1,2,3} for n>=2. Conjecture: a(n)/n -> 3/2.
LINKS
EXAMPLE
As a word, A286419 = 011111001011110110011..., in which 1 is in positions 2,3,4,5,6,9,...
MATHEMATICA
s = Nest[Flatten[# /. {0 -> {0, 1}, 1 -> {1, 0}}] &, {0}, 9] (* A010060 *)
w = StringJoin[Map[ToString, s]]
w1 = StringReplace[w, {"0100" -> "1"}]
st = ToCharacterCode[w1] - 48 (* A286419 *)
Flatten[Position[st, 0]] (* A286420 *)
Flatten[Position[st, 1]] (* A286421 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, May 09 2017
STATUS
approved