It was around 200 BC.
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The Sieve of Eratosthenes filters numbers, letting the composites fall through while the primes remain.
the person that invented the sive was actually eratosthenes of cyrene. cyrene is were he lived which is now in libya, he name the sive after himslef. he was a great mathematician, astronmer, and a excellant geograher, he also worked in a library.
One
A sieve.
composite numbers