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A064167 Product of numerator and denominator of the n-th harmonic number, 1 + 1/2 + 1/3 +...+ 1/n. +0
1
1, 6, 66, 300, 8220, 980, 50820, 213080, 17965080, 18600120, 2320468920, 2384502120, 412970037480, 422245703880, 430902992520, 1756076802480 (list; graph; listen)
OFFSET

1,2

COMMENT

Numerator and denominator in definition have no common divisors >1.

EXAMPLE

The 3rd harmonic number is 11/6. So a(3) = 11 * 6 = 66.

CROSSREFS

Sequence in context: A045641 A071276 A119172 this_sequence A119073 A028559 A062184

Adjacent sequences: A064164 A064165 A064166 this_sequence A064168 A064169 A064170

KEYWORD

nonn

AUTHOR

Leroy Quet (qq-quet(AT)mindspring.com), Sep 19 2001

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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