open-problem tag added
Artin's conjecture for n=2
I am interested in the following question:
Is it known that $2$ is a primitive root modulo $p$ for infinitely many primes $p$?
there is some information about Artin's conjecture in http://en.wikipedia.org/wiki/Artin%27s_conjecture_on_primitive_roots
I need to know if it is up to date and if one can say something about the case n=2.