20190222, 05:09  #1 
Feb 2019
2 Posts 
New Prime? (...NO)
Possible Prime?
M90,xxx,xxx might be a new prime! The admins have been notified and will investigate this result before it can be checked in. LucasLehmer test: !!!PRIME!!! Last fiddled with by axn on 20190222 at 05:37 Reason: Hidden the expo. 
20190222, 05:39  #2 
Jun 2003
4593_{10} Posts 
I have hidden the exponent. What makes you think you have found a prime? A "No factor" TF result doesn't mean the number is prime.
If you have completed a successful LL test or PRP test and got back a positive result, you can just check that result in to the server. 
20190222, 08:17  #3 
Jul 2009
Germany
3×79 Posts 
He checked in a 83M ,a 89M and some double check LLresults in to the server today, maybe he is right.........
Last fiddled with by moebius on 20190222 at 08:18 
20190222, 08:43  #4 
"Mihai Preda"
Apr 2015
2·11·47 Posts 
I can run a PRP with GpuOwl, expected time about 2days. Please PM me the exponent if desired.

20190222, 09:57  #5 
Jul 2018
34_{8} Posts 
I can also offer verification via CUDALucas in 90 hours.

20190222, 11:56  #6 
Sep 2003
A12_{16} Posts 
Some recent results from TravisJank have mismatches: 49769581, 49867891, 51237019, 55863571, and others have error codes marked Suspect: 88648837, 88735033, 88828589, 88903769.
The machine NGTJP1 has two mismatches, two Suspect unverified results, and two verified good. The machine NGBTJ has one mismatch, one Suspect unverified result, and three verified good. The machine DVROG has one mismatch, one Suspect unverified result, and one verified good. Several other machines have clean track records. Which machine found the possible prime? Last fiddled with by GP2 on 20190222 at 12:04 
20190222, 15:31  #7 
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
3·1,279 Posts 
confirmation time
If I recall correctly, confirmation run durations were of order 2 days to a bit under a day depending on hardware and software combination last time, for 82589933. Scaling to 90M, on same hardware and software, by p^{2.12}, aspiring confirmation testers would need to have validly estimated run times of under about 2.4 days (~58 hours) to be competitive.
The fft file generated by CUDALucas 2.06 May 5 2017 build for an NVIDIA GTX 1080 Ti contains (fftl(K) max exponent ms/iter) 5184 95507747 3.5816 so running a 90M LL (without Jacobi check; none implemented yet in CUDALucas) would take about 89.5 hours. Best timing I have for gpuowl is V6.2, 4.206ms on an AMD RX480 at 5 M fft length, corresponding to a bit over 105. hours. (This would have a Gerbicz check so would be quite reliable.) DualXeone52670: 4.43 msec/iter in prime95 V29.4b8, so 110.75 hours. I'd be willing to run verifications on any of these, but based on timings, it looks like I'm not in the running for confirmation of suspected primes. I'd be happy to run a DC on a suspected false positive, on any of the above. https://www.mersenneforum.org/showpo...3&postcount=29 Last fiddled with by kriesel on 20190222 at 16:07 
20190222, 15:51  #8 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
3×7×383 Posts 
George thinks the chances are this is a bad compile of a GPU program. He has gotten the save file from the OP and other info. Enjoy your weekend, nothing to see here.

20190222, 16:06  #9 
P90 years forever!
Aug 2002
Yeehaw, FL
15273_{8} Posts 
Sorry, Travis. I just looked at the save file in a text editor and it appears to be all zeroes.
Please use the latest CudaLucas (which may be marked Beta) (2.06??), it is supposed to detect this problem. I have no idea why this important fix never made it into the production version. 
20190222, 16:41  #10 
Einyen
Dec 2003
Denmark
3^{4}×5×7 Posts 
Last fiddled with by ATH on 20190222 at 16:41 
20190222, 17:11  #11  
Banned
"Luigi"
Aug 2002
Team Italia
7^{2}×97 Posts 
Quote:


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