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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) 2^{53}  1 is the largest prime that the prime number tester on this site will test. [Dunn] 2^53 is prime. [Dunn] The smallest value of A(3,k) which is not a prime or prime power. A(m,n) is Ackerman's function. [Hartley]
(There is one curio for this number that has not yet been approved by an editor.)
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