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The smallest five-digit composite number ending in 1, 3, 7 or 9 that yields no primes if the first digit is changed. I.e., 20027, 30027, 40027, 50027, 60027, 70027, 80027 and 90027 are all composite.

 

  Submitted: 2003-12-30 04:21:58;   Last Modified: 2008-01-30 11:28:00.



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