The book is now available! 2347
(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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2347 and 4723 are the only primes concatenated from two double-digit primes whose the products of digits are perfect numbers, i.e., 6, 28. [Loungrides]


  Submitted: 2013-06-05 04:19:17;   Last Modified: 2018-04-04 05:58:09.

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