

A225186


Squares in the ThueMorse word A001285.


3



11, 22, 1212, 2121, 121121, 212212, 12211221, 21122112, 122112122112, 211221211221, 1221211212212112, 2112122121121221, 122121121221122121121221, 211212212112211212212112, 12212112211212211221211221121221, 21121221122121122112122112212112
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OFFSET

1,1


COMMENTS

A square in an infinite word w is a factor of the form uu, where u has finite length.
Consists of 11, 22, 121121, 212212 and their repeated images under the morphism 1 > 12, 2 > 21.
Replacing {1,2} by {0,1} gives the squares in A010060.


REFERENCES

James D. Currie and Narad Rampersad, Infinite words containing squares at every position, RAIROTheor. Inf. Appl. 44, 113124 (2010).


LINKS

Table of n, a(n) for n=1..16.


CROSSREFS

Cf. A001285, A020060, A225188 (square roots).
Sequence in context: A094620 A077431 A118133 * A155973 A253684 A180481
Adjacent sequences: A225183 A225184 A225185 * A225187 A225188 A225189


KEYWORD

nonn


AUTHOR

N. J. A. Sloane, May 04 2013


STATUS

approved



