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Old 2020-02-01, 02:17   #507
GP2
 
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The 343rd fully-factored or probably-fully-factored Mersenne number with prime exponent (not including the Mersenne primes themselves) is M2749.

The most recent factor (65 digits!) was found by Ryan Propper on January 28 and the PRP test was done by Jinyuan Wang.

The cofactor has already been certified prime.

FactorDB link
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Old 2020-02-01, 08:55   #508
LaurV
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Quote:
Originally Posted by GP2 View Post
fully-factored or probably-fully-factored <snip>
The cofactor has already been certified prime.
Then, it is not "probable", but sure :)
Congrats to the finder and all contributors!

Last fiddled with by LaurV on 2020-02-01 at 08:55
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Old 2020-02-01, 11:44   #509
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Quote:
Originally Posted by LaurV View Post
Then, it is not "probable", but sure :)
The set, of which it is the 343rd, consists of fully-factored and probably-fully-factored numbers.
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Old 2020-02-01, 12:27   #510
xilman
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Quote:
Originally Posted by LaurV View Post
Then, it is not "probable", but sure :)
Congrats to the finder and all contributors!
OR.

Not EXOR
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Old 2020-02-02, 08:28   #511
LaurV
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Quote:
Originally Posted by axn View Post
fully-factored and probably-fully-factored numbers.
Quote:
Originally Posted by xilman View Post
OR.
Not EXOR
Yaarrr
Ye nitpickers!


Last fiddled with by LaurV on 2020-02-02 at 08:30
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Old 2020-02-04, 19:54   #512
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Default Least unproven cofactor

What is the least unproven Mersenne cofactor? I would like to ECPP it.

NVM. I found M78,737 on https://www.mersenne.ca/prp.php

Last fiddled with by paulunderwood on 2020-02-04 at 20:32
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