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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) The prime whose reversal factors into the two extremal primes with only the four prime digits: 17731711 = 2357*7523. Note that the latter primes concatenate to another prime (23577523) that remains a prime when each digit is replaced by its complement (87533587). [Beedassy]
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