31

This number is a prime.

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The first U.S. space satellite (Explorer-I) weighed just less than 31 pounds and was launched on Jan 31, 1958. The high-power transmitter worked for 31 days. [McCranie]

Submitted: 2002-04-11 20:22:55;   Last Modified: 2008-03-28 18:22:46.
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