The book is now available! 22
(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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22 is the smallest multidigit composite palindrome such that the concatenation (211) as well as the sum (13) of its prime factors are prime. [De Geest]


  Submitted: 2003-02-08 17:16:21;   Last Modified: 2008-01-30 11:28:00.

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