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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

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665 - 5 is the smallest prime of the form ac - b, where b = a - 1. Note that c is the concatenation of a and b. [Kulsha]

 

  Submitted: 1999-09-04 13:48:26;   Last Modified: 2008-01-30 11:28:00.



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