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Search: id:A072161
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A072161 Denominator of Sum_{k=1..n} phi(k)/k^4. +0
2
1, 16, 1296, 10368, 6480000, 6480000, 15558480000, 124467840000, 3360631680000, 3360631680000, 49203008426880000, 49203008426880000, 1405287123680119680000, 1405287123680119680000, 1405287123680119680000, 11242296989440957440000 (list; graph; listen)
OFFSET

1,2

EXAMPLE

1, 17/16, 1409/1296, 11353/10368, 7137097/6480000, 7147097/6480000, ...

CROSSREFS

Cf. A072160.

Adjacent sequences: A072158 A072159 A072160 this_sequence A072162 A072163 A072164

Sequence in context: A000490 A027648 A016828 this_sequence A072914 A007480 A134375

KEYWORD

nonn,frac

AUTHOR

njas, Jun 28 2002

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Last modified October 12 13:44 EDT 2008. Contains 144830 sequences.


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