The book is now available! 29999999999
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

                                                                2 9999999999
+ The largest “d-sphenic number” obtained by inserting d d's, (where d is a digit), between the digits of a 2-digit prime, (nine 9's between the digits of 29). A “d-sphenic number” is a sphenic number whose prime factors have the same length d, i.e., 29999999999 = 2113 × 3767 × 3769. Note that concatenating in some order its prime factors we create an emirp, i.e., 376737692113. [Loungrides]

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