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Old 2020-12-03, 17:53   #1
Oct 2020
Terre Haute, IN

25·3 Posts
Default List of exponents which have already been factored?

Is there a list in progress showing all exponents which have been or are currently being factored? And for exponents which have already been factored, does Prime95 give a message that a particular exponent has already been factored?
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Old 2020-12-03, 18:45   #2
6809 > 6502
Uncwilly's Avatar
Aug 2003
101×103 Posts

1012410 Posts

The database on PrimeNet does track known factors. It is too large to be included in the program Prime95. If you request to do a PRP on an exponent with a known factor, PrimeNet won't give you an assignment ID.

You can see the factors here:
Or if you want to see exponents that have no known factor :
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Old 2020-12-05, 07:09   #3
Bemusing Prompter
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Dec 2002

242510 Posts
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Old 2020-12-07, 08:02   #4
Romulan Interpreter
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Jun 2011

265016 Posts

James of has all of them nicely zipped periodically, you can ask him nicely for a download link. I used to get all the zips from him in the past, for backup purposes, I have them somewhere, but not updated for a long time. The archives are "gigabytes" al together... (the exponents go to 10G, which is 10 times the GIMPS range).
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