311

This number is a prime.

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The largest prime of the form |a^b - c^d|, where a, b, c and d are the first 4 primes. 311 = 7^3 - 2^5. Curiously, 311 = prime(2^6). [Post]

Submitted: 2009-11-25 17:38:02; Last Modified: 2009-11-27 20:14:53.