167

This number is a prime.

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There are two 167-digit numbers consisting of only two distinct digits which are of the form p*2^167 with p prime. They correspond to the numbers containing only the digits 6 & 7, and 8 & 9. [Rupinski]

Submitted: 2003-03-07 05:24:54; Last Modified: 2011-03-08 22:26:53.