This works not only for n = 4 but also for any n.By using this formula, you can always get the nth prime number.. But so far I have suppressed one piece of information. We have assumed that a ...

For example, we’ve known since the 18th century that n² + n + 41 is prime for values of n up to 39. It breaks down at n = 40, as the formula gives 1681,… Advertisement ...

MATHEMATICIANS have spent millennia trying to understand prime numbers – those only divisible by themselves and 1 – but so far no one has discovered a formula for all of them.