Eratosthenes

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Eratosthenes of Cyrene (276 BCE - 194 BCE), a Greek mathematician (among other things), was chief librarian of the Great Library of Alexandria. He also devised a system of latitude and longitude, and was the first known person to have calculated the circumference of the Earth.

He also invented a method of finding Prime Numbers, called the Sieve Of Eratosthenes, that doesn't require division (although most people implement this incorrectly and do use division.)

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