This number is a prime.

+ The largest known prime p such that (p^p-1)/(p-1) is also a (probable) prime. Note that (p^p-1)/(p-1) = Cyclotomic(p,p). Found by H. Lifchitz, June 2003. [Noe]

(There is one curio for this number that has not yet been approved by an editor.)

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