The book is now available! 1913
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

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The difference between an emirp and its reverse is always divisible by 18. So is 3191 - 1913 = 71 * 18. But, 1913 is the smallest emirp such that the difference is 18 times an emirp. [Poo Sung]

 

  Submitted: 2018-05-22 08:16:56;   Last Modified: 2018-05-22 08:25:14.



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