# Chen Primes

A prime number p is called a Chen prime if p + 2 is either a prime or a product of two primes (also called a semiprime). The even number 2p + 2 therefore satisfies Chen's theorem.

The Chen primes are named after Chen Jingrun, who proved in 1966 that there are infinitely many such primes. This result would also follow from the truth of the twin prime conjecture.

First 20: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 47, 53, 59, 67, 71, 83, 89

Checkout list of first: 10, 50, 100, 500, 1000 chen primes. You can also check all chen primes.

## Visualization#

Every frame counter is increased by one. If it is chen prime then dot appears. Color has no meaning. Video has 25fps.

You can also compare it with other types.

## External#

- OEIS: A109611
- Wikipedia: Chen Primes
- Youtube: Visualization up to 1 million

## Tags#

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