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![](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b9/Sieve_of_Eratosthenes_animation.gif/360px-Sieve_of_Eratosthenes_animation.gif)
Credit: SKopp
The Sieve of Eratosthenes was one of the first methods developed for finding prime numbers. The method is simple but is still effective for finding all the primes to a given range.
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