The rule for working out prime numbers is really simple, but no one has ever worked out a simple
formula for telling you whether a very big number is a prime number or what the next one will be. If a
number is really, really big, it can take a computer years to work out whether it is a prime number.
Prime numbers are useful for writing codes and in America they are classed as Military Material and if
you find one over 100 digits long you have to tell the CIA and they buy it off you for $10,000. But it
would not be a very good way of making a living.
Prime numbers are what is left when you have taken all the patterns away. I think prime numbers are like
life. They are very logical but you could never work out the rules, even if you spent all your time thinking
about them.