1000000999999

This number is a prime.

100 0000999999

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The largest emirp less than a googol formed by concatenating two consecutive numbers of the form 10^n and 10^n-1 (case n=6). [Loungrides]

Submitted: 2015-11-30 11:27:18; Last Modified: 2018-04-26 12:32:11.