The book is now available! 253
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ 253 - 1 is the largest prime that the prime number tester on this site will test. [Dunn]

+ 2^5-3 is prime. [Dunn]

+ The smallest value of A(3,k) which is not a prime or prime power. A(m,n) is Ackerman's function. [Hartley]

(There is one curio for this number that has not yet been approved by an editor.)

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