OFFSET
0,9
LINKS
EXAMPLE
n=10: 5th powers of prime not exceeding 1024 are: 32,243 so a(10)=2.
MATHEMATICA
Table[ PrimePi[ Floor[ 2^(g/5)//N ] ], {g, 0, 150} ]
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, May 09 2001
EXTENSIONS
Missing a(0)=0 inserted by Sean A. Irvine, Jan 09 2023
STATUS
approved