Jelaskan Newman–Shanks–Williams primes dari Daftar bilangan prima

Newman–Shanks–Williams numbers that are prime.

7, 41, 239, 9369319, 63018038201, 489133282872437279, 19175002942688032928599 ()

Primes p for which the least positive primitive root is not a primitive root of p2.  Three such primes are known; it is not known whether there are more.