The book is now available! 6666666
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The only 7-digit repdigit number such that the product of itself and all truncations of itself plus one is prime, i.e., 6666666*666666*66666*6666*666*66*6+1 is prime. [Loungrides]


  Submitted: 2015-02-11 06:27:34;   Last Modified: 2015-02-11 06:32:22.

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