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The only prime concatenated in order from four double-digit primes, such that the inverted number of the number formed from their product is also prime, i.e., 17 * 23 * 29 * 59 = 669001 and 100699 is prime. [Loungrides]

 

  Submitted: 2016-08-07 05:08:06;   Last Modified: 2016-08-07 06:31:33.



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