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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) The 5th primedigit prime is 23 and 523 is prime. The 23rd primedigit prime is 773 and 23773 is prime. The 773rd primedigit prime is 2522753 and 7732522753 is prime. What about the 2522753rd? Curiously, the concatenation of 5, 23, 773 and 2522753 is another prime. [Petrov]
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