13683...88363 (4359-digits)

This number is a prime.

+ As of November 2004, (2^14479+1)/3 was the largest proven prime of the form N(p)=(2^p+1)/3. This form figures in the new Mersenne conjecture. N(14479) was proven prime by Marcel Martin's programme Primo, which yielded this certificate of an elliptic curve primality proof. [Broadhurst]

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