The book is now available! 8888
(another Prime Pages' Curiosity)
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The only four-digit repdigit such that the sum of itself and all truncations of itself minus one, i.e., 8888+888+88+8 - 1 = 9871 is an emirp. [Bajpai]

 

  Submitted: 2015-02-23 08:47:05;   Last Modified: 2015-02-23 09:49:43.



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