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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) The primes 3, 7, 109, and 673, are quite remarkable. By taking any two primes and concatenating them in any order the result will always be prime. For example, taking 7 and 109, both 7109 and 1097 are prime. The sum of these four primes, 792, represents the lowest sum for a set of four primes with this property. (Project Euler, Problem 60)
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