326
This number is a composite.
As of mid-September of 2012, the home prime (HP(n)) of 326 was
publicly reported as an open question with a 99-digit composite factor outstanding. [Merickel]
3³ + 2³ + 6³ is prime. [Homewood]
(There are 12 curios for this number that have not yet been approved by an editor.)
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