139

This number is a prime.

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+ The largest prime, less than a googol, formed by concatenating in ascending order the first n powers of 3 (n=3). Note that for n=2 we take the smallest such prime (emirp). [Loungrides]

+ 139 is the only number n less than 1000 such that 2^999-n is prime. [Loungrides]

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