19999...99999 (54-digits)

This number is a prime.

1999 9999999999 9999999999 9999999999 9999999999 9999999999

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

Submitted: 2009-05-08 14:31:39; Last Modified: 2009-05-08 16:43:54.