The book is now available! 12321...34543 (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)

                                                 12321 2342123432 3453234543
+ Reading left-to-right, each digit gives you the number of letters required in the Roman numeral representation from I to XXV.

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