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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]


  Submitted: 2010-05-04 20:12:26;   Last Modified: 2010-05-05 06:53:51.

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