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(another Prime Pages' Curiosity)
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312 is the only number m less than 30000 such that prime(k*m) + k*m is prime for k = 1, 11, 1111, 111111, 11111111, and 111111111. [Firoozbakht]

 

  Submitted: 2004-02-10 12:14:40;   Last Modified: 2008-01-30 11:28:00.



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