99999...99999 (2631-digits)
This number is a prime.
Just showing those entries submitted by 'Dobb': (Click here to show all)
Written as 1315 9s, one 2, and 1315 9s, this 2631-digit number is both a palindrome and a "near-repdigit" prime. It was found to be prime by Harvey Dubner in 1989. [Dobb]
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