Quote:
Originally Posted by hhh
Background:There are 14 Cullen primes known, but only with composite exponents, and nobody knows if there is one with a prime exponent. That's why this project exists.

I think the probability that n*2^n+1 is prime for a random n number is O(1/n). This is also true for n=p prime numbers so the number of prime exponents Cullen primes up to exponent=n is sumprime(p=2,n,O(1/p))=O(log(log(n)). If this is true, than there're infinitely many Cullen primes with prime exponents. But the chance to find a slution is extremely small.