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A090864
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Complement of generalized pentagonal numbers (A001318).
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8
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3, 4, 6, 8, 9, 10, 11, 13, 14, 16, 17, 18, 19, 20, 21, 23, 24, 25, 27, 28, 29, 30, 31, 32, 33, 34, 36, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 52, 53, 54, 55, 56, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 71, 72, 73, 74, 75, 76, 78, 79, 80, 81, 82, 83, 84
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Also n for which A006906(n) is even, or equivalently n for which A000009(n) is even (since A006906 and A000009 have the same parity).
It is conjectured that for all of these n it is possible to express 0 as a sum of the products of partitions of n, e.g. n=4 gives 4,3,4,2,1 and 0=4-3-4+2+1
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FORMULA
| A080995(a(n)) = 0; A000009(a(n)) = A118303(n). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 22 2006
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CROSSREFS
| Cf. A006906.
Sequence in context: A080702 A156167 * A118300 A134745 A183867 A182829
Adjacent sequences: A090861 A090862 A090863 * A090865 A090866 A090867
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KEYWORD
| nonn
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AUTHOR
| Jon Perry (perry(AT)globalnet.co.uk), Feb 12 2004
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EXTENSIONS
| More terms from Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 22 2006
Edited by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 14 2011
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