9767

This number is a prime.

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(9767, 9769) is the first case of a twin prime pair that can be represented as the product of a repdigit number and all its truncations minus 1 and plus 1, i.e., 222*22*2-1=9767 and 222*22*2+1=9769. [Loungrides]

Submitted: 2016-02-15 08:16:50;   Last Modified: 2018-04-02 04:19:56.
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