A question concerns prime numbers - MathOverflow most recent 30 from http://mathoverflow.net 2013-05-25T13:02:04Z http://mathoverflow.net/feeds/question/104598 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/104598/a-question-concerns-prime-numbers A question concerns prime numbers Tina 2012-08-13T07:05:45Z 2012-08-13T14:02:31Z <p>I have arrived to this conjecture in my work, I am not sure that is true or false. So I would appreciate if someone give a counterexample or prove it.</p> <p>My question: Let n be a non-prime such that n-1 be a prime. Is it true that there exist a prime p such that n-p is a prime as well?</p> http://mathoverflow.net/questions/104598/a-question-concerns-prime-numbers/104604#104604 Answer by S. Carnahan for A question concerns prime numbers S. Carnahan 2012-08-13T09:06:25Z 2012-08-13T09:06:25Z <p>The conjecture that any even number (greater than 4) is the sum of two odd primes is well-known to be open. You are asking about a special case that is also open.</p>