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Search: id:A119794
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| A119794 |
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a(n) = product of positive integers each of which is <= n and is divisible by exactly one prime dividing n (but is coprime to every other prime dividing n). (a(1) = 1). |
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+0
4
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| 1, 2, 3, 8, 5, 24, 7, 384, 162, 1920, 11, 17280, 13, 322560, 97200, 10321920, 17, 58060800, 19, 1393459200, 51438240, 40874803200, 23, 536481792000, 375000, 25505877196800, 7142567040, 535623421132800, 29, 439378587648000, 31
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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EXAMPLE
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12 is divisible by 2 and 3. The positive integers which are <= 12 and which are
divisible by 2 or 3, but not by both 2 and 3, are: 2,3,4,8,9,10.
a(12) = the product of these integers, which is 17280.
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CROSSREFS
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Cf. A116512, A119790, A120499.
Sequence in context: A072500 A062956 A053650 this_sequence A117987 A091136 A140651
Adjacent sequences: A119791 A119792 A119793 this_sequence A119795 A119796 A119797
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet Jul 30 2006
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EXTENSIONS
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Corrected and extended by Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), Aug 12 2006
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