OFFSET
1,2
COMMENTS
Given the fact that phi(n) > sqrt(n) for all n except n=2 and n=6 we can see that every 11th power does appear as value only a finite number of times. What bounds on the density of this sequence can be proved?
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..3625
EXAMPLE
phi(4096) = 2048 = 2^11.
MATHEMATICA
For[n = 1, n < 100000, n++, If[EulerPhi[n]^(1/11) == Floor[EulerPhi[n]^(1/11)], Print[n]]]
CROSSREFS
KEYWORD
nonn
AUTHOR
Stefan Steinerberger, Feb 17 2006
EXTENSIONS
More terms from Stefan Steinerberger, May 16 2007
STATUS
approved