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A026606 [1->null]-transform of three-symbol Thue-Morse A026600, with 1 subtracted. 0
1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 1, 2, 1, 2, 1, 2, 2, 1, 2, 1, 1, 2, 1, 2, 1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 1, 2, 1, 2, 1, 2, 2, 1, 2, 1, 1, 2, 1, 2, 1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Old name was: a(n) = b(n)-1, where b(n) = n-th term of A026600 that is not a 1.

From Michel Dekking, Apr 18 2019: (Start)

This sequence 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->1, 2->2, 3->1, 4->2, 5->2, 6->1.

Then (a(n)) = delta(x), where x = 1234... is a fixed point of sigma.

This representation can be obtained by noting that this sequence, with 1 added, can also be viewed as the [1->23, 2->23, 3->32]-transform of A026600, and by doubling 1,2 and 3, renaming the resulting six letters as 1,2,3,4,5,6.

(End)

LINKS

Table of n, a(n) for n=1..90.

CROSSREFS

Cf. A026605, A057215.

Sequence in context: A144083 A332292 A054350 * A265918 A207676 A161175

Adjacent sequences:  A026603 A026604 A026605 * A026607 A026608 A026609

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

Name changed by Michel Dekking, Apr 18 2019

STATUS

approved

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Last modified May 7 23:48 EDT 2021. Contains 343652 sequences. (Running on oeis4.)