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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) 4226 = phi(4)^sigma(4) + phi(2)^sigma(2) + phi(2)^sigma(2) + phi(6)^sigma(6). Note that 4226 is the earliest multidigit number with this property. [Firoozbakht]
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