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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ If you place this palindromic prime in a 3-by-3 square,
7  3  3
3  5  3
3  3  7
then each column and diagonal, sum of each column and diagonal, along with the total sum digits is prime. [Blanchette]




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