The book is now available! 7351
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ The product of the factorials of the digits of 7351 produce another factorial: 7! * 3! * 5! * 1! = 10!.

+ The sum of the digits of 7351 equals the square of their average. Note that the first four odd numbers are used. [Edwards]

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