Math Help - necessary and sucient condition on q for 3 to be a primitive root modulo p

1. necessary and sucient condition on q for 3 to be a primitive root modulo p

Let p, q be odd primes with p = 2q + 1.

Find a necessary and sucient condition on q for 3 to be a primitive
root modulo p.

2. Re: necessary and su

I guess you can use the same type of proof as is here, sophie germain prime primitive root.

Salahuddin
Maths online