1. Sieve of Eratosthenes

2. http://en.wikipedia.org/wiki/Sieve_of_Eratosthenes http://www.hbmeyer.de/eratclass.htm The Sieve of Eratosthenes is a method that seeks out all the prime numbers in a given group of numbers. A prime number is a number greater than 1 and whose multiples can only be itself and 1. For example, 2 is a prime number because its multiples are only 2 and 1, therefore, the Sieve of Eratosthenes says to cross out all numbers in a given group that are multiples of 2, except 2 itself.

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