2497
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The sum of the first 2497 positive repunits (i.e.,
1+11+111+1111+11111+...) is a 2497-digit prime number. Note
that 2497 is the smallest number for which this happens. [Antonious]
Submitted: 2019-01-19 11:02:20; Last Modified: 2019-01-19 15:43:27.
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