The book is now available! 6517
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ The sum of digits of 6517 = 7^3 * 19 equals its largest prime factor. Both 6^4 + 5^3 + 1^2 + 7^1 and 6! + 5! + 1! + 7! are also primes. [Post]




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