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Old 2018-03-08, 02:55   #1
Jan 2018

48 Posts
Default M20521

This number has been fully factored (certified). It nevertheless appears in the ECM progress report.
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Old 2018-03-08, 05:13   #2
P90 years forever!
Prime95's Avatar
Aug 2002
Yeehaw, FL

162638 Posts

Fixed, thanks.
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Old 2018-03-08, 05:25   #3
Bemusing Prompter
ixfd64's Avatar
Dec 2002

22×3×197 Posts

I've noticed that PRP triple-check is marked as "Factored." This doesn't make sense because the cofactor can't be factored further.

I also have a suggestion: if a cofactor is determined to be a probable prime, then the residue should probably just say PRP. PRP_PRP_PRP_PRP_ looks pretty messy in my opinion.

Last fiddled with by ixfd64 on 2018-03-08 at 05:26
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