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The largest prime factor of the alternate-digit, palindromic semiprime 1010101010101010101010101010101010101 is the repunit prime 1111111111111111111. Both numbers contain 19 1's. [Green]

 

  Submitted: 2009-12-19 20:22:32;   Last Modified: 2009-12-19 21:17:14.



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