8

This number is a composite.

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For n > 8, prime(n) > π(n) + sigma(n), so 8 is the only number n such that prime(n) = π(n) + sigma(n). [Firoozbakht]

Submitted: 2009-10-06 18:47:04;   Last Modified: 2009-10-06 19:47:34.
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