This number is a composite.

Just showing those entries submitted by 'Silva': (Click here to show all)

+ The only three-digit repdigit that yields twin primes of the form aaa + a*a*a +/- 1. [Silva]

+ 666+666+666 +/- 1 is a pair of twin primes. [Silva]

(There are 4 curios for this number that have not yet been approved by an editor.)

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