The book is now available! 77777...77777 (25-digits)
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

                                                 77777 7777774447 7777777777
+ The smallest "special" wing square-congruent prime of order 5. (Special wing primes are palindromic primes in base 10, and consisting of one central 3-digit number of identical digits surrounded by two wings having an equal amount of identical digits and different from the central digits). [Loungrides]

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