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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) Formed from 17 followed by its reversal repeated three times. Repeating the reversal before 17, we obtain another prime: 71717117. Taking the reversal of 17 and and using the same process, two new primes are yielded: 71171717, 17171771. Note that the reversal must be repeated at least three times with a number to give prime. [Silva]
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