20121009, 04:06  #1 
Romulan Interpreter
Jun 2011
Thailand
2^{4}×571 Posts 
mersenne.ca (ex mersennearies.sili.net)
Do we have a thread for it? (could not find one). Like technical support, bug reports, advertizing, feature request, etc? Like for other projects? That site is quite serious now and lived for a while, so it might get its own subforum? Or it has one already and I can't find it.. If so, please some mod move the post there, or if not, then James may create one...
So, why do I bother, I was trying to do some comparison between CuLu "efficiency" (price, performance, consumption) of some cheap cards, and when I accessed the CuLu card database page and click on any card, I got: Code:
Warning: Division by zero in /var/www/vhosts/mersenne.ca/httpdocs/cudalucas.php on line 194 edit: This was not the case for the old page, before moving the domain Last fiddled with by LaurV on 20121009 at 04:08 
20121009, 04:14  #2 
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
3·29·83 Posts 
http://www.mersenneforum.org/forumdisplay.php?f=30
It was apparently archived a while ago, when it went from an active GIMPS project to a "just" a neat site (because of PNv5, I think). Last fiddled with by Dubslow on 20121009 at 04:14 
20131102, 17:21  #3 
Romulan Interpreter
Jun 2011
Thailand
2^{4}·571 Posts 
Sorry for waking up this old sleeping thread. Still looking for the section in discussion :D
Now, I am trying to report some factors to mersenne.ca and got back punches in the nose: Code:
Notice: Undefined variable: factor5 in /var/www/vhosts/mersenne.ca/httpdocs/index.php on line 199 Notice: Undefined variable: exponent_type in /var/www/vhosts/mersenne.ca/httpdocs/index.php on line 203 Notice: Undefined variable: exponent_type in /var/www/vhosts/mersenne.ca/httpdocs/index.php on line 270 Skipping 64306421  only Mersenne (not Fermat) exponents are currently accepted. Email James if you think this is in error. 
20131119, 03:29  #4 
"Mark"
Feb 2003
Sydney
3×191 Posts 
Problem: for my latest P1 factor (of M64369951) to find the factors of k I went to http://www.mersenne.ca/factor.php, which brightly reported that 308859196150824 = 2 × 154429598075412. I can iterate, so the page reports 154429598075412 = 2 × 77214799037706, and so on...
This carried through to http://www.mersenne.ca/exponent.php?...tails=64369951 as well. It had the correct k, 308859196150824, factored into 2 × 154429598075412. A factor found a few days ago for M64522099 has the correct prime factors of k in both pages. 
20131119, 03:55  #5 
Romulan Interpreter
Jun 2011
Thailand
2^{4}·571 Posts 
Hehe, did it give you 40 million GHzDays credit? (for that factorization of k, you are in that range, if I am not mistaken)

20131119, 11:27  #6 
"Mark"
Feb 2003
Sydney
3×191 Posts 
Very good, yes it did  30 to 55 million! Even though further down the page it knows the actual bounds.
btw, fwiw, the second example was wrong, it was M64272539 that had a factor & showed correctly. 
20131120, 11:50  #7 
"Mark"
Feb 2003
Sydney
3·191 Posts 
So far, just one with the problem.
Code:
M64272539 has a factor: 9071055458279594221185001 k = 70567116216457500 = 2^2 * 3^2 * 5^4 * 163 * 5839 * 3295291 M64369951 has a factor: 39762502644255858979249 k = 308859196150824 = 2 × 154429598075412 instead of 2^3 * 3 * 11 * 17 * 63607 * 1081939 M64560521 has a factor: 1702954647929500068960097 k = 13188823615050288 = 2^4 * 3 * 263 * 373 * 439 * 6380221 
20131123, 16:33  #8  
"Richard B. Woods"
Aug 2002
Wisconsin USA
2^{2}×3×641 Posts 
Quote:
Last fiddled with by cheesehead on 20131123 at 16:40 

20131125, 21:01  #9 
"Mark"
Feb 2003
Sydney
1000111101_{2} Posts 
Thanks cheesehead. Mersenne.ca is just my first port of call for factoring, being in the Mersenne context & all. I was just pointing out that for this case it is an outlier, when the variability between sites should be low.

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