19

This number is a prime.

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For decades, mathematicians the world over would open their doors to find the homeless Paul Erdős (1913-1996) announcing, "My brain is open!" It is rumored that for 19 hours a day, seven days a week, stimulated by coffee, and later by amphetamines, he worked on mathematics. One of his greatest achievements was the discovery of an elementary proof for the prime number theorem.

Submitted: 1999-09-02 23:40:00;   Last Modified: 2009-04-17 03:18:53.
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