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

+ A prime made from perfect power digits that is the average of two 4th powers made from its 2 rightmost digits: ((7^4)+(9^4))/2 = (((8-1)^4)+(8+1)^4)/2. [Post]

+ The smallest prime of the form n!/9 + 1. [Gudipati]




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