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The numbers 1429, 1428571429, 1428571428571429... form a sequence equal to (10^(6n+4)+3)/7. 14682887281 is the largest prime factor of the first composite number in this sequence (it has the factorization 157*601*1031137*14682887281).


  Submitted: 2004-07-29 17:34:38;   Last Modified: 2008-01-30 11:28:00.

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