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Sophie Germain prime
A prime number p is called a Sophie Germain prime if 2p + 1 is also prime. For example, 23 is a Sophie Germain prime because it is a prime and 2*23+1 = 47, also prime.
It is not known whether there are infinitely many Sophie Germain primes.
List of Sophie Germain primes
The next table includes the first 500 Sophie Germain primes.
ToDo: List of primes as document
