The book is now available! 98639
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ 98639 is the smallest non-palindromic prime p such that sigma(p) = sigma(reversal(p)). Note that the next such prime is greater than 10^8. [Firoozbakht]

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