login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A098228 a(n) = floor(n/(n-phi(n)) = floor(n/cototient(n)). 0
2, 3, 2, 5, 1, 7, 2, 3, 1, 11, 1, 13, 1, 2, 2, 17, 1, 19, 1, 2, 1, 23, 1, 5, 1, 3, 1, 29, 1, 31, 2, 2, 1, 3, 1, 37, 1, 2, 1, 41, 1, 43, 1, 2, 1, 47, 1, 7, 1, 2, 1, 53, 1, 3, 1, 2, 1, 59, 1, 61, 1, 2, 2, 3, 1, 67, 1, 2, 1, 71, 1, 73, 1, 2, 1, 4, 1, 79, 1, 3, 1, 83, 1, 4, 1, 2, 1, 89, 1, 4, 1, 2, 1, 4, 1, 97 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..97.

EXAMPLE

If n=p^j where p is a prime number, then cototient(p^j) = p^j - p^j(p-1/p) = p^(j-1) so n/cototient(n)=p holds for all prime powers.

MATHEMATICA

Table[Floor[n/(n-EulerPhi[n])], {n, 2, 1000}]

CROSSREFS

Sequence in context: A178380 A178375 A086847 * A081303 A164880 A267068

Adjacent sequences:  A098225 A098226 A098227 * A098229 A098230 A098231

KEYWORD

nonn

AUTHOR

Labos Elemer, Oct 25 2004

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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 20 14:21 EDT 2020. Contains 337264 sequences. (Running on oeis4.)