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Search: id:A154795
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| A154795 |
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Odd partition numbers of odd numbers. |
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+0
4
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| 1, 3, 7, 15, 101, 297, 1255, 4565, 10143, 14883, 21637, 31185, 44583, 63261, 173525, 239943, 329931, 1121505, 1505499, 2679689, 3554345, 4697205, 6185689, 10619863, 18004327, 23338469, 30167357, 38887673, 49995925, 64112359, 82010177
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OFFSET
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1,2
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COMMENT
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Odd 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)
7 is in the sequence because the odd number 5 has partition number 7 (5,41,32,311,2221,22111,1111111).
(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)=0 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) = 1 then numbpart(2*n-1) else end if end proc: seq(a(n), n = 1 .. 50); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 02 2009]
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CROSSREFS
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Cf. A000041, A005408, A058695.
Sequence in context: A146448 A023370 A096422 this_sequence A077775 A033089 A153578
Adjacent sequences: A154792 A154793 A154794 this_sequence A154796 A154797 A154798
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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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