The book is now available! 13741
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ 13741 is the smallest natural number n such that both n and n+6 are pseudoprimes to base 2. There are only 2 such pairs < 10^13 and one may call them "sexy pseudoprimes" just like 4369 & 4371 are called "twin pseudoprimes." [Yosei]

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