The book is now available! 123479
(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 first n digits of 123479 (read left-to-right) is either one less or one more than a prime.

+ The smallest prime formed from all of the positive digits that are expressible as sum of two triangular numbers in exactly one way. [Honaker]

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