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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) Write all the singledigit primes (2 3 5 7). Then write the only digits a prime can end with (1 3 7 9). Put the second set of digits between the first set (2 (1) 3 (3) 5 (7) 7 (9)) to get 21335779. [Earls]
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