A man with no home and no job, Paul Erdős (1913–1996) was the most prolific mathematician who ever lived. Erdős inspired generations of mathematicians throughout the world with his insightful approach and wry humor. N is a Number: A Portrait of Paul Erdős follows him for four years through four countries, presenting his mathematical quest and its personal and philosophical dimensions. Animated sequences illustrate the kinds of mathematical problems Erdős pursued.

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