The book is now available! 5237732522753
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

                                                              523 7732522753
+ The 5th prime-digit prime is 23 and 523 is prime. The 23rd prime-digit prime is 773 and 23773 is prime. The 773rd prime-digit prime is 2522753 and 7732522753 is prime. What about the 2522753rd? Curiously, the concatenation of 5, 23, 773 and 2522753 is another prime. [Petrov]

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