id:A072161 - OEIS Search Results

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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.` `Sequence in context: A000490 A027648 A016828 this_sequence A163929 A072914 A007480` `Adjacent sequences: A072158 A072159 A072160 this_sequence A072162 A072163 A072164`
	KEYWORD	`nonn,frac`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Jun 28 2002`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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