11111...11111 (100-digits)

This number is a prime.

                                            1111111111 1111112111 1111111111
1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111

+ The largest near-repunit prime less than a googol. [Gupta]

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

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