I think all we can say is that if N is an illegal prime, then N+1 is not an illegal prime. Well, I suppose a government could try to ban the numbers 2 and 3, b

I think all we can say is that if N is an illegal prime, then N+1 is not an illegal prime. Well, I suppose a government could try to ban the numbers 2 and 3, but it might have trouble complying with that law itself.