1391098979592919

This number is a prime.

139109 8979592919

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The larger of only two primes less than a googol, each formed by concatenating in reverse order the first n primes p ending with 9, p < 1000, (n=7). The smaller one is 592919, for n=3. [Loungrides]

Submitted: 2015-12-17 16:32:23; Last Modified: 2018-11-01 11:41:45.