A mathematician at the University of Central Missouri has discovered the largest known prime number, which is 17,425,170 digits long. The number, 2 raised to the 57,885,161th power minus 1, was found using a network of computers making 150 trillion calculations per second. It is also the 48th example of an uncommon type known as Mersenne primes. The last largest prime number was found in 2008 and contained 12,978,189 digits.

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