The book is now available! 129866728583
(just those submitted by Rupinski)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

                                                               12 9866728583

Just showing those entries submitted by 'Rupinski': (Click here to show all)

+ 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]




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