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

+ The number of ways of seating nine people around a circular table so that no one sits next to any of his neighbors in a previous seating order. [Post]

+ The sum of the squares of the first nine odd non-composite numbers. [Silva]

+ The smallest prime which can be represented as a sum of two squares of a prime and its reversal (232+322). [Poo Sung]

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