login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A068970 Sum(phi(d^4)); d|n. 0
1, 9, 55, 137, 501, 495, 2059, 2185, 4429, 4509, 13311, 7535, 26365, 18531, 27555, 34953, 78609, 39861, 123463, 68637, 113245, 119799, 267675, 120175, 313001, 237285, 358723, 282083, 682893, 247995, 893731, 559241, 732105, 707481 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..34.

FORMULA

Also Sum( d|n, d^m*phi(d^(4-m))) for m=0, 1, 2, 3

Multiplicative with a(p^e) = 1 + p^3 + (p-1)(p^(4e)-1)/(p^4-1)

CROSSREFS

Sequence in context: A058849 A058852 A145875 * A141530 A263478 A016269

Adjacent sequences:  A068967 A068968 A068969 * A068971 A068972 A068973

KEYWORD

easy,nonn,mult

AUTHOR

Benoit Cloitre, Apr 06 2002

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified September 24 21:29 EDT 2017. Contains 292441 sequences.