Quote:
Originally Posted by Housemouse
I am looking for "rare" prime numbers. For purposes of this tread a prime number is rare if there are 10 or less known examples. Even if it is believed that there is an infinate number of primes of a partiocular type; it is rare if there are 10 or less known examples.

Every prime is rare: p is a prime then p is rare because it is only the solution of the equation xp=0.