mersenneforum.org A B.Cereus case of assignment poaching...
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 2013-03-12, 03:40 #1 ixfd64 Bemusing Prompter     "Danny" Dec 2002 California 29×79 Posts A B.Cereus case of assignment poaching... I requested 50 assignments via GPU to 72 last week, and completed them today. However, one of the results was rejected: Code: [Sat Mar 09 09:33:49 2013] UID: ixfd64/andromeda, M61578079 has a factor: 8520992029041896962793 [TF:72:73*:mfaktc 0.20 barrett76_mul32_gs] [Sat Mar 09 09:33:49 2013] UID: ixfd64/andromeda, found 1 factor for M61578079 from 2^72 to 2^73 (partially tested) [mfaktc 0.20 barrett76_mul32_gs] [Sat Mar 09 11:54:58 2013] PrimeNet accepted the other 49 without issues. The 30-day expiration has supposedly been disabled, so there shouldn't be any assignment overlap. I looked up the exponent on http://mersenne.ca and noticed that someone by the name of "Just factoring!" had already submitted the factor. According to the top producers list, this user has only "completed" 28 TF assignments. It's not really a big deal because 1) the factor would have taken just a few minutes to turn up, 2) GPU to 72 still credits me as the discoverer and 3) I could easily get a load of "successes" credited to my name if I wanted to. That having been said, I'd still like to know what happened. Has "Just factoring!" discovered a new integer factorization algorithm? Or perhaps he wasn't aware of GPU to 72, and decided to randomly pick exponents to TF? Anyone have an idea? Last fiddled with by ixfd64 on 2013-03-12 at 03:43
 2013-03-12, 03:59 #2 swl551     Aug 2012 New Hampshire 2×401 Posts two days ago someone else alerted us to "just factoring". I don't recall reading a conclusion. But you have confirmed the poaching. Accidental or not...
 2013-03-12, 05:12 #3 Xyzzy     "Mike" Aug 2002 7,573 Posts What if they only poach exponents with factors?
2013-03-12, 05:47   #4
kladner

"Kieren"
Jul 2011
In My Own Galaxy!

992310 Posts

Quote:
 Originally Posted by Xyzzy What if they only poach exponents with factors?
How would such a person know in advance to run only those exponents?

BTW: The results as shown do not give indication of duplicate results: i.e. Error 40, or some such.

2013-03-12, 06:27   #5
Brain

Dec 2009
Peine, Germany

331 Posts
rofl

Quote:
 Originally Posted by Xyzzy What if they only poach exponents with factors?
Saved my day.

 2013-03-12, 06:31 #6 firejuggler     Apr 2010 Over the rainbow 236510 Posts maybe s/he took a bunch of expo, ran one or two bitlevel and returned only the one with a factor?
2013-03-12, 07:44   #7
kladner

"Kieren"
Jul 2011
In My Own Galaxy!

233038 Posts

Quote:
 Originally Posted by firejuggler maybe s/he took a bunch of expo, ran one or two bitlevel and returned only the one with a factor?
Yeah. Could be. Stupid and ass-holy, though.

2013-03-12, 12:33   #8
Uncwilly
6809 > 6502

"""""""""""""""""""
Aug 2003
101×103 Posts

24×523 Posts

Quote:
 Originally Posted by swl551 two days ago someone else alerted us to "just factoring". I don't recall reading a conclusion.
Quote:
 Originally Posted by firejuggler maybe s/he took a bunch of expo, ran one or two bitlevel and returned only the one with a factor?
I think that when some one mentioned 'just factoring' earlier, I checked Recent Results and found a no factor result, if memory serves.

 2013-03-12, 14:28 #9 petrw1 1976 Toyota Corona years forever!     "Wayne" Nov 2006 Saskatchewan, Canada 3×5×172 Posts His/her YTD TF: 28 Attempts; 1 Factor. Not a big player (yet?) And not just factors
 2013-03-12, 17:53 #10 tcharron   Jan 2013 22·7 Posts Here's someone (else?) who has racked up 3200 GHz-days in the last 2 weeks, most of it by manual testing: tomtr. I came across this as an TF result was rejected. The assignment was given on March 10 and completed on March 11. Last fiddled with by tcharron on 2013-03-12 at 17:54
2013-03-12, 17:59   #11
chalsall
If I May

"Chris Halsall"
Sep 2002
Barbados

2×5×911 Posts

Quote:
 Originally Posted by tcharron Here's someone (else?) who has racked up 3200 GHz-days in the last 2 weeks, most of it by manual testing: tomtr. I came across this as an TF result was rejected. The assignment was given on March 10 and completed on March 11.
Can you please provide the exponent?

It's not a good idea to reveal the exponent while you work it, but many of us are very interested in documenting poachers....

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