A hundred years ago that the mathematician, the projected number of errors specific to a pair of twins. They need to prove that it is not the end, but it is not successful, This problem still needs to be proven further.
Over a hundred years ago, the mathematician attention to the problems predicted the twin primes. They want to prove that the number is infinite. But unfulfilled This issue still needs to be proved.
Hundreds of years ago that mathematicians, pay attention to the problem of predicting prime twins. They want to prove that a never-ending, but not successful. This problem remains to be proven.