1277
This number is a prime.
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(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]
Submitted: 2016-01-26 18:42:05; Last Modified: 2018-04-15 13:52:19.
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