I'm not clear what you mean by "nr" but if you mean just "show that everynumber larger than or equal to 2 is the product of 2 prime numbers", you can't.
It pretty obviously is not true! (Look at "9".)
I'm not clear what you mean by "nr" but if you mean just "show that everynumber larger than or equal to 2 is the product of 2 prime numbers", you can't.
It pretty obviously is not true! (Look at "9".)