20211106, 21:43  #573  
Sep 2002
Database er0rr
4,349 Posts 
Quote:


20211106, 21:45  #574 
Feb 2017
Nowhere
17CC_{16} Posts 
So would I. But if he were willing to do legwork himself, he would not have posted his query. I posted the links for the benefit of others. Back when I was a new user, I was advised to use "show single post" in referring to previous posts. Locating the page with a given post number in a long thread can be tedious.
But, just for fun, I will mention that two smaller p > 1000000 for which M_{p} has a large PRP cofactor are mentioned on this Forum, somewhere in this thread, which is a predecessor to the present one. That thread is much shorter than this one. 
20211106, 22:05  #575  
"Tucker Kao"
Jan 2020
Head Base M168202123
2^{5}×5^{2} Posts 
Quote:
I wish there can be a new specialized page for Known Cofactor Probable Primes or Fully factored Mersenne Numbers that are not Mersenne Primes under Current Progress menu of the GIMPS homepage. The total quantity is scarce enough that qualifies to be the Mersenne treasures of the discoverers. Last fiddled with by tuckerkao on 20211106 at 22:15 

20211106, 22:27  #576  
If I May
"Chris Halsall"
Sep 2002
Barbados
2^{2}×2,713 Posts 
Quote:
Why don't you step up, and curate that? Might reduce the noise here on the Forum. Just asking... 

20211107, 02:22  #577  
Jun 2003
3^{4}×67 Posts 
Quote:


20220419, 03:41  #578 
Sep 2002
Database er0rr
4,349 Posts 
Congrats to Gelly (Robert Gelhar) for proving prime the cofactor of 2^1063911
Last fiddled with by paulunderwood on 20220419 at 03:42 
20220523, 12:13  #579 
Sep 2002
Database er0rr
4349_{10} Posts 
Congrats to Ryan for proving the cofactor of M78737 using FastECPP.

20220525, 19:56  #580 
Sep 2002
Database er0rr
4,349 Posts 
M86137 cofactor has been certified prime by yours truly.
Last fiddled with by paulunderwood on 20220525 at 19:58 
20220526, 01:08  #581 
"Rashid Naimi"
Oct 2015
Remote to Here/There
2^{2}×5^{2}×23 Posts 
Congrats for proving a now P25924 prime.

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