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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) The next self prime year is 2099. A self number (or Columbian number) is an integer which cannot be generated by any other integer added to the sum of its digits (e.g., 25 is not a self number because 25 = 17+1+7). These were first described in 1949 by the Indian mathematician D. R. Kaprekar.
(There is one curio for this number that has not yet been approved by an editor.)
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