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Old 2018-09-09, 03:52   #2
Citrix
 
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Jun 2003

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For k*b^n+-1, I think you are talking about fixed b and n and variable k?

Some of this is randomness involved with distribution of factors.
When n has a lot of small factors and k is a power then they could have a factor.

e.g. 4*5^10-1 will have factors 2*5^5+1 and 2*5^5-1
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