login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A057215 [1->01, 2->10, 3->01]-transform of 3-symbol Thue-Morse A026600. 2
0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Old name was: Analog of A026600 using instead of 1: 0,1; instead of 2: 1,0; instead of 3: 0,1.

A nonperiodic sequence of 0 and 1, with one 0 and one 1 in every subsequence of three terms.

From Michel Dekking, Apr 17 2019: (Start):

(a(n)) is a morphic sequence, i.e., a letter-to-letter projection of a fixed point of a morphism.

Let the morphism sigma be given by

    1->123, 2->456, 3->345, 4->612, 5->561, 6->234,

and let the letter-to-letter map delta be given by

    1->0, 2->1, 3->1, 4->0, 5->0, 6->1.

Then (a(n)) = delta(x), with x the fixed point of sigma starting with 1.

This representation can be obtained by doubling 1,2 and 3, and renaming the resulting six letters as 1,2,3,4,5,6.

(End)

This sequence essentially equals A026605, which is its standard form: a(n) = A026605(n)-1 for all n. - Michel Dekking, Apr 18 2019

LINKS

Table of n, a(n) for n=0..104.

Index entries for sequences that are fixed points of mappings

MATHEMATICA

Flatten[ Nest[ Flatten[ # /. {1 -> {1, 2, 3}, 2 -> {2, 3, 1}, 3 -> {3, 1, 2}}] &, {1}, 4] /. {1 -> {0, 1}, 2 -> {1, 0}, 3 -> {0, 1}}] (* Robert G. Wilson v, Mar 09 2005 *)

CROSSREFS

Cf. A026600, A026605

Sequence in context: A287657 A079336 A288670 * A284905 A291197 A269927

Adjacent sequences:  A057212 A057213 A057214 * A057216 A057217 A057218

KEYWORD

nonn

AUTHOR

Richard Blavy, Sep 24 2000

EXTENSIONS

Name changed by Michel Dekking, Apr 17 2019

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 22 07:23 EDT 2019. Contains 325216 sequences. (Running on oeis4.)