It states that: every even integer greater than 2 can be expressed as the sum of two primes.

It is one of the best-known unsolved math problems in number theory. Accordingly to Wikipedia it is shown that it is true for up to 4*10^18 but it still remains unproven.

It is a known unsolved problem in number theories. Best mathematicians are trying to solve it for a long time, to be precise - since 7 June 1742.................