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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) The prime number 167772161 which is equal to 2^25*5+1 was found in 1878 to be a factor of 2^(2^23)+1 or Fermat 23 by Pervushin (also spelled Pervouchine). Note that it was found 125 years later in 2003 by Dario Alpern to be a factor of 10^(10^100)1 or a googolplex minus one. [Dobb]
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