369
This number is a composite.
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369 = (π(3) + π(6) + π(9)) * (prime(3)+prime(6)+prime(9)). Note that 369 is the largest (second) and only odd number with this property. [Firoozbakht]
Submitted: 2004-08-16 12:06:37; Last Modified: 2008-01-30 17:28:00.
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