OFFSET
1,1
LINKS
Donovan Johnson, Table of n, a(n) for n = 1..1000
EXAMPLE
The set invphi(2*3)={7,9,14,18}. It has 4 terms, so a(2)=4, while invphi(2*1601)={3203,6406}, thus a(252)=2.
MAPLE
with(numtheory): [seq(nops(invphi(2*ithprime(i))), i=1..256)];
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Jan 08 2001
EXTENSIONS
Offset corrected by Donovan Johnson, Apr 28 2013
STATUS
approved