The book is now available! 28999...99999 (30-digits)
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

                                            2899999999 9999999999 9999999999
+ The only non-titanic prime formed from a perfect number n followed by n times a digit d., i.e., 28 followed by 28 9’s. [Loungrides]

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