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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) The largest known composite number for which the quotient of the repunit R(n) divided by R(a)*R(b) [a and b the factors of n] forms a unique prime. I.e., 6437 = 41*157 and R(6437)/(R(41)*R(157)) is prime.
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