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Search: id:A056612
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| A056612 |
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GCD(n!, n!(1+1/2+1/3+...+1/n)). |
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+0
4
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| 1, 1, 1, 2, 2, 36, 36, 144, 144, 1440, 1440, 17280, 17280, 241920, 3628800, 29030400, 29030400, 1567641600, 1567641600, 156764160000, 9876142080000, 217275125760000, 217275125760000, 1738201006080000, 1738201006080000
(list; graph; listen)
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OFFSET
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1,4
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COMMENT
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The first difference between this sequence and A131657 occurs for n=20, while the first difference between this sequence and A131658 occurs for n=21. - Christian Krattenthaler (christian.krattenthaler(AT)univie.ac.at), Sep 30 2007
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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FORMULA
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a(n)=A000142(n)/A002805(n)=A000254(n)/A001008(n). - Franz Vrabec (franz.vrabec(AT)planetuniqa.at), Sep 13 2005
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EXAMPLE
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a(4) = GCD(4!, 4!(1+1/2+1/3+1/4)) =GCD(24, 50) = 2.
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CROSSREFS
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Cf. A007757, A131657, A131658.
Sequence in context: A018976 A074127 A024176 this_sequence A131658 A131657 A059523
Adjacent sequences: A056609 A056610 A056611 this_sequence A056613 A056614 A056615
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KEYWORD
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easy,nonn
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AUTHOR
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Leroy Quet Aug 08 2000
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