The book is now available! 393
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ 1000^393 - 393 is prime. Note that 393 is the second and largest known number with this property. [Firoozbakht]

+ The smallest semiprime formed by inserting a semiprime between the semiprime's ordered factors. Can you find a large example?

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