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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) The only threedigit number n such that 10^n + n + 1 is prime. [Patterson] (288) = prime(2+8+8). It is the largest number with this property. [Gupta]
(There is one curio for this number that has not yet been approved by an editor.)
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