The book is now available! 9551
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ Compare 9551 with the 9551st prime. [Punches]

+ The largest prime found in the following array:

 9 1 3 3
 1 5 8 3
 7 5 2 9
 3 9 1 1.
Every row, column, and main diagonal is a different emirp. Ignoring rotations, it is the only possible 4-by-4 prime magic square of this type.

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