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The first composite number ending in 1, 3, 7, or 9 that cannot be made prime by changing the first digit to any number including zero. I.e., 183, 2183, 3183, 4183, 5183, 6183, 7183, 8183 and 9183 are all composite.

 

  Submitted: 2004-06-22 21:46:26;   Last Modified: 2008-01-30 11:28:00.



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