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2^{13466917}  1 is the first prime number to be found to have more digits than the year it was discovered squared, i.e., more than 2001^{2}. [Luhn]
Click here for information on the 39th Mersenne prime. The largest known Mersenne prime exponent that is an emirp. Note that the sum of its digits is also an emirp. [Loungrides]
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