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A165135
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The number of n-digit positive papaya numbers.
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4
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OFFSET
| 1,1
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COMMENTS
| Papaya numbers are concatenations of two palindromes or palindromes themselves. All one-digit, as well as, all two-digit numbers are papaya numbers.
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LINKS
| Tanya Khovanova, Papaya Words and Numbers [From Tanya Khovanova (tanyakh(AT)yahoo.com), Oct 01 2009]
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FORMULA
| a(n) = A052268(n)-A165611(n). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 25 2009]
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EXAMPLE
| Three-digit papaya numbers are of four types: aaa (total of 9) and aab, aba, abb, (total of 81 for each). Hence a(3) = 252.
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CROSSREFS
| Cf. A165610, A165611 [From Tanya Khovanova (tanyakh(AT)yahoo.com), Oct 01 2009]
Sequence in context: A140160 A043960 A044641 * A180289 A054616 A052386
Adjacent sequences: A165132 A165133 A165134 * A165136 A165137 A165138
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KEYWORD
| base,more,nonn,uned
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AUTHOR
| Sergei Bernstein and Tanya Khovanova (tanyakh(AT)yahoo.com), Sep 04 2009
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EXTENSIONS
| Two more terms by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 25 2009
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