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Search: id:A064453
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| A064453 |
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Number of finite positive integer sequences b(1),..,b(k), with k <= n and b(1)*b(2)*.....*b(k) <= n. |
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+0
1
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| 1, 5, 15, 44, 85, 216, 343, 806, 1299, 2155, 2926, 7162, 9477, 13209, 17935, 37824, 47957, 75600, 93613, 138074
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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Sequences b for n = 2 are {1}, {2}, {1, 1}, {2, 1}, {1, 2}, so a(2)=5.
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CROSSREFS
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Sequence in context: A032193 A005665 A025471 this_sequence A059251 A109952 A076103
Adjacent sequences: A064450 A064451 A064452 this_sequence A064454 A064455 A064456
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KEYWORD
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nice,nonn
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AUTHOR
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Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Oct 02 2001
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