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Search: id:A056494
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| A056494 |
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Number of primitive (period n) periodic palindromes using a maximum of three different symbols. |
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+0
1
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| 3, 3, 6, 12, 24, 42, 78, 144, 234, 456, 726, 1392, 2184, 4290, 6528, 12960, 19680, 39078, 59046, 117600, 177060, 353562, 531438, 1061280, 1594296, 3186456, 4782726, 9561552, 14348904, 28690752, 43046718
(list; graph; listen)
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OFFSET
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1,1
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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)*A038754(n/d+1) where d|n.
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CROSSREFS
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Cf. A056459.
Sequence in context: A112434 A050067 A046875 this_sequence A123140 A123289 A096572
Adjacent sequences: A056491 A056492 A056493 this_sequence A056495 A056496 A056497
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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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