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18854317021 = 197 * 421 * 463 * 491. This is the first 4-brilliant Carmichael number whose prime factors are 3-digits in length. Note that it truncates on one side to the prime 18854317, and on the other side to the prime 854317021. [Carmichael]

 

  Submitted: 2004-11-02 08:53:54;   Last Modified: 2008-01-30 11:28:00.



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