OFFSET
1,4
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..1000
MATHEMATICA
Table[PrimeNu[EulerPhi[Prime[n]!]], {n, 1, 50}] (* G. C. Greubel, May 13 2017 *)
PROG
(PARI) for(n=1, 50, print1(omega(eulerphi(prime(n)!)) , ", ")) \\ G. C. Greubel, May 13 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Jul 17 2000
STATUS
approved