41111...11111 (73-digits)

This number is a prime.

                                                                         411
1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111

+ The largest prime less than a googol in the sequence 4, 41, 411, 4111, 41111, etc. [Jha]

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