1609
This number is a prime.
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The year Galileo turned a telescope to the sky, and turned man's view of the world upside down. Note that 1609 turned upside down gives another prime, making 1609 an invertible prime. [Teague]
Submitted: 2009-12-14 21:32:21; Last Modified: 2009-12-15 12:56:03.
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