The book is now available! 7515
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ 7515 = 3^2 * 5 * 167. Add the unique prime factors to get the product of the digits, which uses the same digits as those of the original number: 3 + 5 + 167 = 175 = 7 * 5 * 1 * 5. [Post]

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