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A056498
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Number of primitive (period n) periodic palindromes using exactly two different symbols.
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1
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0, 1, 2, 3, 6, 7, 14, 18, 28, 39, 62, 81, 126, 175, 246, 360, 510, 728, 1022, 1485, 2030, 3007, 4094, 6030, 8184, 12159, 16352, 24381, 32766, 48849, 65534
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome.
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REFERENCES
| M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
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FORMULA
| Sum mu(d)*A027383(n/d-2) where d divides n and assuming that A027383(-1)=0.
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CROSSREFS
| Cf. A056463.
Sequence in context: A117087 A000837 A200144 * A018652 A125686 A018748
Adjacent sequences: A056495 A056496 A056497 * A056499 A056500 A056501
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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