20170609, 17:34  #309  
Sep 2002
Database er0rr
2·3·19·31 Posts 
Quote:
Code:
time ../../coding/gwnum/lucasPRP M611999cofactor 1 2 611999 1 Lucas testing on x^2  9*x + 1 ... Is Lucas PRP! real 2m21.692s user 5m2.932s sys 2m41.120s 

20170903, 13:16  #311  
Sep 2003
3^{2}·7·41 Posts 
Quote:
The new factor showed up at FactorDB and at mersenne.ca, but not at mersenne.org... presumably mersenne.ca and mersenne.org exchange data both ways daily, so it would get there eventually? But I decided to manually report it to mersenne.org anyway, just to be sure... "Insufficient information for accurate CPU credit. For stats purposes, assuming factor was found using ECM with B1 = 50000. CPU credit is 0.0000 GHzdays." If the actual discoverer is a GIMPS user, maybe the database can be adjusted. 

20170911, 18:08  #312  
Sep 2003
2583_{10} Posts 
Quote:
M1489 has a factor: 95909518295775374166321292697000685895150503357477127 (53 digits) It was reported (by who?) to FactorDB on August 17. The remaining 295digit cofactor is composite, however. Does anyone know who this person is, who is finding large new factors for very small Mersenne exponents, independently of GIMPS. Just a month ago, I ran a systematic crosscheck of exponents under 1 million (prompted by this thread), and synchronized the data on both FactorDB and GIMPS. Obviously it will be worthwhile to keep checking FactorDB every few weeks, for the very small exponents at least, to see if new ones keep cropping up. Last fiddled with by GP2 on 20170911 at 18:11 

20170911, 18:54  #313 
Bamboozled!
"πΊππ·π·π"
May 2003
Down not across
3·11^{2}·29 Posts 

20170911, 19:34  #314 
Sep 2003
3^{2}·7·41 Posts 

20170911, 21:26  #315  
Feb 2017
Nowhere
2^{2}·1,049 Posts 
Quote:
Quote:


20170911, 23:54  #316  
Sep 2003
3^{2}×7×41 Posts 
Quote:
Also, anyone that contributes to these forums would surely manually report any new finds to PrimeNet, which our mystery person is not doing. 

20170912, 00:36  #317  
"Curtis"
Feb 2005
Riverside, CA
11×421 Posts 
Quote:
Both would be world records. 

20170912, 00:45  #318  
Sep 2003
3^{2}·7·41 Posts 
Quote:
I either had a brain freeze or I didn't know what I was talking about. Pick the most charitable explanation. 

20170912, 01:09  #319 
"Forget I exist"
Jul 2009
Dumbassville
2^{6}×131 Posts 
to be fair other than primes the cofactor can't divisors up to a 106 digit number otherwise the composite divisor would have to divide by one of the primes already given or a prime below the last divisor shown.

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