666
This number is a composite.
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The numbers 666*6*910+1, 666*(6+6)*910+1 and 666*(6+6+6)*910+1 are all prime. Hence, their product is a "beastly" Carmichael number. [Patterson]
Submitted: 2003-03-09 20:26:56; Last Modified: 2011-07-21 12:10:15.
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