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                                                                     1818181
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A smoothly undulating tedradic palindromic prime which is (7*11) digits in length and has a sum of digits equal to 7^3. Note that the difference between the two digits it uses equals 7. [Necula]

 

  Submitted: 2004-01-17 09:21:52;   Last Modified: 2008-01-30 11:28:00.



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