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Old 2006-03-18, 09:16   #6
Mystwalker's Avatar
Jul 2004
Potsdam, Germany

11001111112 Posts

For a number that large, you can only try to find a factor and thus prove it's not prime.

Proving primalty of number of no special form can't be done for such big numbers. The biggest such number I heard of has been proven prime had ~15,000 digits...
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