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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