It s a prime number, of course. It is also the hypotenuse of the smallest Pythagorean triangle. Phillips, R. 1994. Wells, D. 1997. The Penguin Dictionary of Curious and Interesting Numbers , rev.
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He is the author of The Mathematical Tourist , Islands of Truth , Newton's Clock , Fatal Defect , and The Jungles of Randomness . For children ages 10 and up. Copyright 1999 Science Service . All rights reserved.