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The smaller of two 6-digit repdigit numbers such that the product of itself and all truncations of itself plus one is prime, i.e., 444444*44444*4444*444*44*4+1=6859617106413367297. The other is 666666. [Loungrides]

Submitted: 2016-02-24 08:31:23;   Last Modified: 2018-05-26 07:49:58.
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