641
This number is a prime.
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The Great Library of Alexandria, home to such mathematicians as Euclid, Archimedes, Eratosthenes, Apollonius, and Pappus, had disappeared before the arrival of the Muslim Arab armies in A.D. 641.
Submitted: 2006-01-03 02:23:48; Last Modified: 2009-06-25 17:59:02.
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