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Search: id:A138808
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| A138808 |
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Number of integer pairs <x,y>, x>0, y>0, s.t. x<=p, y<=p for any factorization n=p*q. |
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+0
1
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| 1, 3, 5, 8, 9, 14, 13, 20, 21, 26, 21, 35, 25, 38, 41, 48, 33, 57, 37, 64, 61, 62, 45, 84, 65, 74, 81, 96, 57, 109, 61, 112, 101, 98, 101
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Conjecture: the row sums of the plane partitions A010766 are upper bounds. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 06 2008]
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EXAMPLE
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a(8)=these 20 marked *'s:
-|12345678
-+--------
1|********
2|****
3|**
4|**
5|*
6|*
7|*
8|*
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CROSSREFS
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Sequence in context: A002159 A050094 A137319 this_sequence A018804 A032682 A022769
Adjacent sequences: A138805 A138806 A138807 this_sequence A138809 A138810 A138811
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KEYWORD
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nonn,new
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AUTHOR
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Jonas Wallgren (jonwa(AT)ida.liu.se), May 16 2008
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