The book is now available! 9991
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ Q: Is 9991 prime? A: 9991 = 10000 – 9 = 100^2 – 3^2 = (100 – 3)(100 + 3) = 97 * 103. Therefore, the number 9991 is composite. [Haratis]

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