# 9999999900000001

This number is a prime.

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

The greatest prime factor of any 48-digit repdigit is 9999999900000001. [Green]

9999999900000001 is the 8th known prime, p, such that
(p)^{2} divides (p)_{3}. Can you find other cases like this? [Green]

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