OFFSET
0,8
LINKS
EXAMPLE
n=12, 4th powers of prime not exceeding 4096 are: 16,81,625,2401 so a(12)=4.
MATHEMATICA
Table[ PrimePi[ Floor[ 2^(g/4)//N ] ], {g, 0, 100} ]
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, May 09 2001
EXTENSIONS
Missing a(0)=0 inserted by Sean A. Irvine, Jan 09 2023
STATUS
approved