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Search: id:A136182
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| A136182 |
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a(n) = product{k=1 to d(n)-1) LCM(b(k),b(k+1)), where b(k) is the kth positive divisor of n, and d(n) = the number of positive divisors of n. |
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4
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| 1, 2, 3, 8, 5, 72, 7, 64, 27, 200, 11, 20736
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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a(n) = the product of the terms in row n of A136181.
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EXAMPLE
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The positive divisors of 20 are 1,2,4,5,10,20. LCM(1,2)=2. LCM(2,4)=4. LCM(4,5)=20. LCM(5,10)=10. And LCM(10,20)=20. So a(20) = 2*4*20*10*20 = 32000.
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CROSSREFS
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Cf. A136179, A136181, A136183.
Adjacent sequences: A136179 A136180 A136181 this_sequence A136183 A136184 A136185
Sequence in context: A109844 A128779 A112283 this_sequence A067911 A051696 A066570
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KEYWORD
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more,nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Dec 19 2007
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