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For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome.
Also aperiodic necklaces (Lyndon words) that are the same when turned over.
M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
Table of n, a(n) for n=1..42.
Index entries for sequences related to Lyndon words
Sum mu(d)*A029744(n/d) where d divides n.
Sequence in context: A108618 A097719 A249050 * A001371 A001037 A122086
Adjacent sequences: A056490 A056491 A056492 * A056494 A056495 A056496
Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
More terms and additional comments from Christian G. Bower, Jun 22 2000