168

This number is a composite.

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168 = sigma(sigma(sigma(1+6+8))) and 1+6+8 = π(1*6*8). 168 is the only number with these two properties. [Firoozbakht]

Submitted: 2004-09-03 10:35:01;   Last Modified: 2009-05-08 21:03:41.
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