The book is now available! 21111...11113 (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)

                                                 21111 1111111111 1111111113
+ Inserting twenty three 1's between the digits of the prime 23 we find another prime whose the product and the sum of digits are consecutive perfect numbers. [Loungrides]

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