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twin prime numbers

A twin prime is a prime p for which at least one of p - 2 and p + 2 is prime. Both members of each pair are included.

The first few twin prime numbers are: 3, 5, 7, 11, 13, 17, 19, 29, 31, 41, 43, 59, …

16,337 of the first one million positive integers are twin prime.

Learn more about twin prime numbers on wikipedia.

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