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Sophie Germain prime numbers

A Sophie Germain prime is a prime p for which 2p + 1 is also prime.

The first few sophie germain prime numbers are: 2, 3, 5, 11, 23, 29, 41, 53, 83, 89, 113, 131, …

7,746 of the first one million positive integers are sophie germain prime.

Learn more about sophie germain prime numbers on wikipedia.

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