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131071 is the largest known prime of form 2^(2^k+1)1, where k = 4. [Luhn]
The concatenation of first four happy numbers in reverse order is prime. [Gupta] Pietro Cataldi verified that 131071 is a Mersenne prime in the year 1588. Did the defeat of the Spanish Armada have something to do with it? The largest nth Mersenne prime with n digits. [Beedassy]
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