The book is now available! 91511...84001 (23707-digits)
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ This 23707-digit number is a pseudoprime in every base less than 10^1100, yet it has 524286 proper divisors. Here is the explanation. [Broadhurst]

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