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738197503 + 1 is the first composite with 27 prime factors (11*2^26). The next prime that has a composite upper neighbor with more prime factors is 2147483647 (the 8th Mersenne prime). [Pfoertner]


  Submitted: 2004-09-12 13:31:35;   Last Modified: 2008-01-30 11:28:00.

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