OFFSET
1,2
FORMULA
a(n) almost equals A096509(n^n) >= a(n) because here only primes are counted, the true prime powers not.
EXAMPLE
a(3)=3 and the 3 primes in [23,31] are {23,29,31}.
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Jul 14 2004
STATUS
approved