8888
This number is a composite.
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The only four-digit repdigit such that the product of itself and all truncations of itself plus one is prime, i.e., 8888*888*88*8 + 1 is prime. [Opao]
Submitted: 2003-12-15 05:57:29; Last Modified: 2016-02-09 14:33:59.
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