8693
This number is a prime.
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The number consisting of 8693 followed by 8693 1's is
prime, in addition to 8693 itself. There is only one other
4-digit prime p for which p followed by p 1's is also
prime: 1051. [Keith]
Submitted: 2023-12-21 20:19:29; Last Modified: 2023-12-22 01:17:34.
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