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The smallest composite number ending in 1, 3, 7 or 9 that yields no primes if its first digit is changed. I.e., 2071, 3071, 4071, 5071, 6071, 7071, 8071 and 9071 are all composite numbers.

 

  Submitted: 2003-12-30 04:17:23;   Last Modified: 2008-01-30 11:28:00.



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