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A288218 Positions of 1 in A288216; complement of A288217. 3
3, 6, 8, 12, 17, 20, 22, 28, 30, 35, 39, 42, 44, 48, 53, 57, 60, 62, 67, 69, 75, 78, 80, 86, 88, 93, 97, 100, 102, 108, 111, 113, 117, 122, 124, 129, 133, 136, 138, 143, 145, 151, 155, 158, 160, 164, 169, 172, 174, 180, 182, 187, 191, 194, 196, 200, 205, 209 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Conjecture: a(n)/n -> 3.61..., and if m denotes this number, then 0 < m - a(n)/n) < 1 for n >= 1.

LINKS

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

MATHEMATICA

s = {0, 0}; w[0] = StringJoin[Map[ToString, s]];

w[n_] := StringReplace[w[n - 1], {"00" -> "1000", "10" -> "010"}]

Table[w[n], {n, 0, 8}]

st = ToCharacterCode[w[21]] - 48   (* A288216 *)

Flatten[Position[st, 0]]  (* A288217 *)

Flatten[Position[st, 1]]  (* A288218 *)

CROSSREFS

Cf. A288216, A288217.

Sequence in context: A310139 A341435 A301283 * A212984 A006048 A049827

Adjacent sequences:  A288215 A288216 A288217 * A288219 A288220 A288221

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Jun 19 2017

STATUS

approved

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Last modified May 8 09:57 EDT 2021. Contains 343666 sequences. (Running on oeis4.)