19999...99999 (54-digits)

This number is a prime.

                 1999 9999999999 9999999999 9999999999 9999999999 9999999999

Just showing those entries submitted by 'Loungrides': (Click here to show all)

+ The largest near-repdigit prime, less than a googol, of the form p=2*10^n-1 (n=53). [Loungrides]

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