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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) 255 is the least odd integer greater than 3 which is not the sum of two distinct powers of two and a prime. The 255th Euler number is the only Euler number with a composite index that is prime. It is also the largest known Euler prime.
(There are 2 curios for this number that have not yet been approved by an editor.)
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