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A289129 Positions of 0 in A289128; complement of A289130. 3
1, 2, 4, 5, 7, 8, 11, 12, 14, 16, 18, 19, 22, 25, 28, 29, 31, 33, 35, 37, 39, 41, 43, 44, 47, 50, 53, 56, 59, 62, 65, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 97, 100, 103, 106, 109, 112, 115, 118, 121, 124, 127, 130, 133, 136, 139 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Conjecture:  a(n)/n -> 5/2..., and 0 < 5/2 - a(n)/n < 3/2 for n >= 1.

LINKS

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

MATHEMATICA

z = 11; (* number of iterates *)

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

w[n_] := StringReplace[w[n - 1], {"00" -> "0010", "01" -> "011", "10" -> "010"}]

TableForm[Table[w[n], {n, 0, 10}]]

st = ToCharacterCode[w[z]] - 48   (* A289128 *)

Flatten[Position[st, 0]]  (* A289129 *)

Flatten[Position[st, 1]]  (* A289130 *)

CROSSREFS

Cf. A289128, A289130.

Sequence in context: A274427 A187576 A188298 * A290334 A206285 A229303

Adjacent sequences:  A289126 A289127 A289128 * A289130 A289131 A289132

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Jun 28 2017

STATUS

approved

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Last modified January 23 16:48 EST 2020. Contains 331173 sequences. (Running on oeis4.)