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A072160 Numerator of Sum_{k=1..n} phi(k)/k^4. 1
1, 17, 1409, 11353, 7137097, 7147097, 17199059897, 137714029801, 3721352084627, 3722696337299, 54537603391194659, 54547094712264659, 1558510008178113485699, 1558729492839246365699, 1558951562903235322883, 12472984853932601449939 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

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

CROSSREFS

Cf. A072161.

Sequence in context: A203229 A269791 A256020 * A078814 A242282 A129911

Adjacent sequences:  A072157 A072158 A072159 * A072161 A072162 A072163

KEYWORD

nonn,frac

AUTHOR

N. J. A. Sloane, Jun 28 2002

STATUS

approved

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Last modified March 22 17:25 EDT 2019. Contains 321422 sequences. (Running on oeis4.)