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2019-11-27, 15:33   #496
Prime95
P90 years forever!

Aug 2002
Yeehaw, FL

17·457 Posts

Quote:
 Originally Posted by GP2 This was actually discovered yesterday, but for some reason PrimeNet did not send the usual notification.

2019-11-27, 16:02   #497
paulunderwood

Sep 2002
Database er0rr

397810 Posts

Quote:
 Originally Posted by GP2 The 339th fully-factored or probably-fully-factored Mersenne number with prime exponent (not including the Mersenne primes themselves) is M216317. The most recent factor was found by Niels_Mache_Nextcloud and the PRP test was done by mnd9. This exponent is too big to be certified prime by Primo. FactorDB link This was actually discovered yesterday, but for some reason PrimeNet did not send the usual notification.

Code:
time echo "print((2^216317-1)/9551099878153/42354904941257/1528559546583299567/6527839497610595205744558551)" | gp -q |./lucasPRP - 1 2 216317 -1
Lucas testing on x^2 - 3*x + 1 ...
Is Lucas PRP!

real	0m18.301s
user	0m18.344s
sys	0m0.012s

 2019-11-27, 16:47 #498 ATH Einyen     Dec 2003 Denmark 325310 Posts PFGW concurs: Code: Primality testing (2^216317-1)/9551099878153/42354904941257/1528559546583299567/6527839497610595205744558551 [N+1, Brillhart-Lehmer-Selfridge] Running N+1 test using discriminant 5, base 1+sqrt(5) Generic modular reduction using generic reduction FMA3 FFT length 21K, Pass1=448, Pass2=48, clm=2 on A 216076-bit number Calling Brillhart-Lehmer-Selfridge with factored part 0.01% (2^216317-1)/9551099878153/42354904941257/1528559546583299567/6527839497610595205744558551 is Lucas PRP! (318.0994s+0.0096s) Last fiddled with by ATH on 2019-11-27 at 16:48
2019-11-27, 18:12   #499
GP2

Sep 2003

5·11·47 Posts

Quote:
 Originally Posted by Prime95 I got both notifications. Your yahoo address was on the CC list. Spam filter?
Nope, nothing in the spam folder.

Not a problem, unless it's a symptom of e-mail problems that might crop up again the next time a Mersenne prime is found.

 2019-12-08, 03:41 #500 GP2     Sep 2003 5·11·47 Posts The 340th fully-factored or probably-fully-factored Mersenne number with prime exponent (not including the Mersenne primes themselves) is M3733. The most recent factor (53 digits) was found by Ryan Propper and the PRP test was done by Yuji Hasegawa. It was the seventh factor for this exponent. The cofactor has already been certified prime by Primo. FactorDB link George let me know about it, since PrimeNet once again did not send the usual notification.
2019-12-08, 03:48   #501
mathwiz

Mar 2019

2×109 Posts

Quote:
 Originally Posted by GP2 George let me know about it, since PrimeNet once again did not send the usual notification.
How does one subscribe to these notifications?

2019-12-08, 04:10   #502
GP2

Sep 2003

5·11·47 Posts

Quote:
 Originally Posted by mathwiz How does one subscribe to these notifications?

2019-12-08, 06:55   #503
Serpentine Vermin Jar

Jul 2014

22×3×277 Posts

Quote:
 Originally Posted by GP2 The 340th fully-factored or probably-fully-factored Mersenne number with prime exponent (not including the Mersenne primes themselves) is M3733. The most recent factor (53 digits) was found by Ryan Propper and the PRP test was done by Yuji Hasegawa. It was the seventh factor for this exponent. The cofactor has already been certified prime by Primo. FactorDB link George let me know about it, since PrimeNet once again did not send the usual notification.
I didn't think the server emailed out notifications for cofactor PRPs.

Anyway... I was going to mark this one as "cofactor proven" in the database, but it's not showing up in the right place yet, probably because the "PRP" result hasn't had a double-check yet.

I'll check on it later if/when someone submits a verifying run - shouldn't take long I'm sure.

 2019-12-08, 18:35 #504 ATH Einyen     Dec 2003 Denmark CB516 Posts Another one factored by Ryan Propper and tested by mrh: https://mersenne.org/M3467 https://mersenneforum.org/showthread.php?t=24989 Last fiddled with by ATH on 2019-12-08 at 18:36
 2019-12-08, 21:53 #505 GP2     Sep 2003 5·11·47 Posts The 341st fully-factored or probably-fully-factored Mersenne number with prime exponent (not including the Mersenne primes themselves) is M3467. The most recent factor (55 digits) was found by Ryan Propper and the PRP test was done by mrh. The cofactor has already been certified prime by Primo. FactorDB link
 2020-01-18, 04:48 #506 GP2     Sep 2003 5·11·47 Posts The 342nd fully-factored or probably-fully-factored Mersenne number with prime exponent (not including the Mersenne primes themselves) is M2887. The most recent factor (56 digits) was found by Ryan Propper and the PRP test was done by Niels_Mache_Nextcloud. The cofactor has already been certified prime. FactorDB link

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