We show that various aspects of k-automatic sequences - such as having an unbordered factor of length n - are both decidable and effectively enumerable. As a consequence it follows that many related sequences are either k-automatic or k-regular. These include many sequences previously studied in the literature, such as the recurrence function, the appearance function, and the repetitivity index. We also give a new characterization of the class of k-regular sequences. Many results extend to other sequences defined in terms of Pisot numeration systems. © 2011 Springer-Verlag.
CITATION STYLE
Charlier, É., Rampersad, N., & Shallit, J. (2011). Enumeration and decidable properties of automatic sequences. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 6795 LNCS, pp. 165–179). https://doi.org/10.1007/978-3-642-22321-1_15
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