1277

This number is a prime.

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+ The smallest prime formed by concatenating n double Mersenne primes (7, 127). Note that 7127 is also a prime. [Loungrides]

+ (1277, 1279) is the first case of a twin prime pair (p, p+2) such that 2^p and 2^(p+2) are both "apocalyptic numbers". [Loungrides]

(There is one curio for this number that has not yet been approved by an editor.)

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