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[[[> IMG:Eratosthenes.jpeg ]]]

Eratosthenes of Cyrene (276 BCE - 194 BCE) was BCE), a Greek mathematician
(among other things), and 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 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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One of the Famous People on this site.