The book is now available! 524287
(another Prime Pages' Curiosity)
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+ 524287 is the seventh Mersenne prime. [Dobb]

+ 524287 is the 39th Fibonacci 19-step number. Note that 2^19-1 = 524287, making it the 7th Mersenne prime. [Loungrides]

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

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