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A287931 Fixed point of the mapping 00->0010, 1->10, starting with 00. 4
0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1

LINKS

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

EXAMPLE

Iterates, starting with 00:

00

0010

0010100

0010100100010

00101001000101000100100

001010010001010001001001000100100010100010

MATHEMATICA

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

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

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

st = ToCharacterCode[w[11]] - 48   (* A287931 *)

Flatten[Position[st, 0]]  (* A287379 *)

Flatten[Position[st, 1]]  (* A287380 *)

Table[StringLength[w[n]], {n, 1, 35}] (* A278381 conjectured *)

CROSSREFS

Cf. A287379, A287380, A287381.

Sequence in context: A285139 A289011 A289071 * A289074 A289242 A188037

Adjacent sequences:  A287928 A287929 A287930 * A287932 A287933 A287934

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Jun 06 2017

STATUS

approved

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Last modified April 20 08:32 EDT 2019. Contains 322306 sequences. (Running on oeis4.)