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

                                                               12 9866728583
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Truncate the rightmost digit and divide the result by two. Repeat using the number so obtained until left with a single digit. This is the largest prime such that repeating this procedure yields a prime at every step. [Rupinski]


  Submitted: 2003-03-17 14:54:05;   Last Modified: 2009-01-06 14:36:45.

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