666

This number is a composite.

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π(6*6*6) = 47 is the only prime number p such that the sum of the digits of 666p is equal to 666. If we define S(n) as the sum of the digits of n, we can write that S(666π(6*6*6)) = 666. [Capelle]

Submitted: 2005-06-26 06:52:40;   Last Modified: 2008-01-30 11:28:00.
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