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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) According to the textbook "Elements of Number Theory" by Pettofrezzo and Byrkit, the largest known twin prime pair in 1975 was {140737488353699, 140737488353701}. The lesser element in the succeeding twin prime pair after a computer algebra system (CAS) calculator search encompassing in excess of five dozen primes is 140737488356207. Of course, such a fifteendigit integer was quite a challenge for the technology available then. [Schiffman]
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