The book is now available! 1913
(just those submitted by Poo Sung)
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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]

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