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Search: id:A154796
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| A154796 |
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Even partition numbers of odd numbers. |
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+0
5
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| 30, 56, 176, 490, 792, 1958, 3010, 6842, 89134, 124754, 451276, 614154, 831820, 2012558, 8118264, 13848650, 133230930, 214481126, 271248950, 541946240, 851376628, 1327710076, 3163127352, 4835271870, 5964539504, 7346629512
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Even numbers in A058695.
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EXAMPLE
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Contribution from Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 02 2009: (Start)
The even number 30 is in the sequence as the partition number of the odd number 9.
(End)
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MAPLE
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aa:= proc(n, i) if n=0 then 1 elif n<0 or i=0 then 0 else aa(n, i):= aa(n, i-1) +aa(n-i, i) fi end: a:= proc(n) local k; if n>1 then a(n-1) fi; for k from `if`(n=1, 1, b(n-1)+2) by 2 while irem (aa(k, k), 2)=1 do od; b(n):= k; aa(k, k) end: seq (a(n), n=1..40); [From Alois P. Heinz (heinz(AT)hs-heilbronn.de), Jul 28 2009]
with(combinat): a := proc (n) if `mod`(numbpart(2*n-1), 2) = 0 then numbpart(2*n-1) else end if end proc: seq(a(n), n = 1 .. 70); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 02 2009]
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CROSSREFS
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Cf. A000041, A005408, A058695, A154795, A154797, A154798.
Sequence in context: A154599 A031126 A048451 this_sequence A004962 A121960 A040870
Adjacent sequences: A154793 A154794 A154795 this_sequence A154797 A154798 A154799
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KEYWORD
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nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Jan 26 2009
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EXTENSIONS
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More terms from Alois P. Heinz (heinz(AT)hs-heilbronn.de), Jul 28 2009
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