The sequence of the primes is something of a mystery in number theory' if not in all of mathematics. Hardly any topic has ever fascinated mathe?maticians more. Euler once said' "Mathematicians have tried in vain' to this day' to discover some order in the sequence of prime numbers' and we have reason to believe that it is a mystery into which the mind will never penetrate". One key question has always been: Does there exist a single' overarching...