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Old 2022-01-25, 13:17   #1
tait1k27
 
Feb 2020

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Default Create a new assignment

How to create a new trial factor assignment with \(M_p\) in Prime95, where \(M_p\) is a composite number

Last fiddled with by tait1k27 on 2022-01-25 at 13:20
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Old 2022-01-25, 14:07   #2
kriesel
 
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Quote:
Originally Posted by tait1k27 View Post
How to create a new trial factor assignment with \(M_p\) in Prime95, where \(M_p\) is a composite number
Well, for GIMPS prime finding purposes, or efficiency, don't.
If you already know M(p)=2p-1 is composite, it's already ruled out as the next Mp discovery.
If it's the exponent that's composite, there are easily found algebraic factors for the corresponding Mn.
TF is so much faster on GPUs that it's a waste of a CPU to do TF in prime95.
If the exponent is so large (>232) that a GPU app such as mfakto or mfaktx can't be used, it's also further beyond prime95's capabilities.
From prime95's "whatsnew.txt":
Quote:
Prime95 should not be used for trial factoring. GPUs are over 10 times more efficient at that task.
Some newer GPUs are up to ~5 bits (~40 times) more effective at TF than at P-1 or PRP.
These and much more are covered in the reference info collection.

Last fiddled with by kriesel on 2022-01-25 at 14:20
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