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Old 2020-07-22, 03:11   #1
Mar 2019

3·17 Posts
Default Help me understand this result?

This was assigned to me (as opposed to me getting it manually). I'm having trouble understanding the results:

1. If it has been Factored, why is my result, and the one before mine, saying its a probable prime?
2. Why is the residue "PRP_PRP_PRP_PRP_"? That doesn't seem right?

Granted, I'm not very knowledgeable on the subject, I just like to Trial Factor mostly. Thanks!
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Old 2020-07-22, 03:53   #2
retina's Avatar
"The unspeakable one"
Jun 2006
My evil lair

24·383 Posts

The number had three known small factors.

So you were assigned the task to determine if the remainder is also a prime. And your result shows it is a prime with good probability, so the remainder is PRP, a probable prime.

Therefore that number is now fully factored (if you assume the PRP result is a real prime).
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Old 2020-07-22, 03:54   #3
6809 > 6502
Uncwilly's Avatar
Aug 2003
101×103 Posts

22·53·19 Posts

The remaining cofactor is a Probable Prime.
There are 3 factors listed. What is left after those are divide out looks to be a prime. Rejoice as this is fully factored now.
Here is the remaining cofactor

Last fiddled with by Uncwilly on 2020-07-22 at 04:00
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Old 2020-07-23, 14:28   #4
Feb 2016
! North_America

79 Posts

Why wouldn't the server assign type 5 prp-cf test? It uses type 5 when there's a factor known...

I must be missing something.
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Old 2020-07-23, 14:37   #5
kruoli's Avatar
Sep 2017
Porta Westfalica, DE

2·241 Posts

"Older" Versions of Prime95 default to type 1. The newer ones doesn't. And if there is a PRP-CF, the DC of it will always be with the same type.
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