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Chen prime numbers

A Chen prime is a prime p for which p + 2 is either prime or the product of exactly two primes, which need not be distinct.

The first few chen prime numbers are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, …

29,949 of the first one million positive integers are chen prime.

Learn more about chen prime numbers on wikipedia.

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