31111...11111 (89-digits)

This number is a prime.

                                                        311111111 1111111111
1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111

+ The largest near-repunit prime p, less than a googol, of the form p=3111...111. [Loungrides]

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