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Search: id:A056499
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| A056499 |
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Number of primitive (period n) periodic palindromes using exactly three different symbols. |
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+0
1
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| 0, 0, 0, 3, 6, 21, 36, 90, 150, 339, 540, 1149, 1806, 3765, 5790, 11880, 18150, 36894, 55980, 113145, 170970, 344541, 519156, 1043190, 1569744, 3149979, 4733670, 9488409, 14250606, 28544205, 42850116
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OFFSET
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1,4
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COMMENT
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For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome.
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REFERENCES
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M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
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FORMULA
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Sum mu(d)*A056489(n/d) where d|n.
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CROSSREFS
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Cf. A056464.
Adjacent sequences: A056496 A056497 A056498 this_sequence A056500 A056501 A056502
Sequence in context: A101582 A069558 A050611 this_sequence A056489 A015649 A076102
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KEYWORD
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nonn
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AUTHOR
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Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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