Chen prime

English Etymology Named after Chinese mathematician Chen Jingrun, who proved in 1966 that there are infinitely many such numbers. Noun en number theory Any prime number p such that p+2 is either a semiprime or another prime. 2013, Laura Hemphill, Buying In, Haughton Mifflin Harcourt (New Harvest), page 278, She tried counting Chen primes. 2, 3, 5... 7, 11... 13... 17... She couldn't concentrate. en 2014 Christian Bessiere; et al Reasoning about Constraint Methods Duc-Nghia Pham; Seong-Bae Park PRICAI 2014: Trends in Artificial Intelligence Springer https://books.google.com.au/books?id=1vdWBQAAQBAJ&pg=PA804&dq=%22Chen+prime%22%7C%22Chen+primes%22&hl=en&sa=X&ved=0ahUKEwjdy-ftibzaAhXK64MKHeWgDygQ6AEIQTAE#v=onepage&q=%22Chen%20prime%22%7C%22Chen%20primes%22&f=false 804 There are even magic square of primes, like this one containing Chen primes discovered by Rudolf Ondrejka: en 2014 Rajesh Kumar Thakur The Power of Mathematical Numbers Ocean Books https://books.google.com.au/books?id=EjRqCwAAQBAJ&pg=PA155&dq=%22Chen+prime%22%7C%22Chen+primes%22&hl=en&sa=X&ved=0ahUKEwjdy-ftibzaAhXK64MKHeWgDygQ6AEINjAC#v=onepage&q=%22Chen%20prime%22%7C%22Chen%20primes%22&f=false 155 A prime number p is called a Chen prime if p + 2 is either a prime or a product of two primes.There are infinitely [many] Chen primes and the first ten are: 2, 3, 5, 7, 11, 13, 17, 19, 23 and 29. See also en cousin prime en prime gap en prime pair en sexy prime Further reading Chen Prime on MathWorld Wolfram MathWorld Prime gap Prime pair Twin prime Twin prime conjecture Polignac's conjecture en eponyms