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Old 2016-04-17, 05:22   #5
wblipp
 
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"William"
May 2003
New Haven

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http://factordb.com/index.php?id=1100000000832503659

Factordb says that it is proven by N-1, although Factordb knows of no prime factors for N-1. It does know of two 4K+ composite factors. I've not seen this before - do you know more about this that might make sense?
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