77777...77771 (100-digits)

This number is a prime.

                                            7777777777 7777777777 7777777777
7777777777 7777777777 7777777777 7777777777 7777777777 7777777777 7777777771

+ The largest prime less than a googol and containing only non-composite digits. [Gupta]

+ The largest prime less than a googol and containing only straight digits. [Gupta]

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