Changes

</blockquote>

</blockquote>

There is no upper limit to the quantity of primes, but there is no known formula for deriving the nth prime.  

There are infinitely many primes. The only [[even]] prime number is 2.   

The only [[even]] prime number is 2.   

==Sieve of Eratosthenes==

==Sieve of Eratosthenes==

{{main|Riemann hypothesis}}

{{main|Riemann hypothesis}}

Most mathematicians believe a proof of the [[Riemann hypothesis]] is the best hope for discovering some pattern in the distribution of prime numbers.  ''The Clay Mathematics Institute'' has offered a one million dollar prize for a proof of the Riemann hypothesis.<ref>http://www.claymath.org/millennium/Riemann_Hypothesis/</ref>

The [[Riemann hypothesis]] is related to patterns in the distribution of prime numbers.  ''The Clay Mathematics Institute'' has offered a one million dollar prize for a proof of the Riemann hypothesis.<ref>http://www.claymath.org/millennium/Riemann_Hypothesis/</ref>

==Cryptography==

==Cryptography==