7

This number is a prime.

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There is a persistent rumor that the philosopher G.W.F. Hegel (1770-1831) provided a logical proof within his doctoral dissertation that there could only be 7 planets in the solar system. [Poo Sung]

Submitted: 2002-02-21 06:59:03; Last Modified: 2008-06-06 12:41:36.