129866728583

This number is a prime.

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 20:54:05; Last Modified: 2009-01-06 20:36:45.