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Old 2012-10-09, 04:06   #1
LaurV
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Default mersenne.ca (ex mersenne-aries.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
Thousands of it, scrolling down...

edit: This was not the case for the old page, before moving the domain

Last fiddled with by LaurV on 2012-10-09 at 04:08
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Old 2012-10-09, 04:14   #2
Dubslow
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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 2012-10-09 at 04:14
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Old 2013-11-02, 17:21   #3
LaurV
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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.
(the colors and bold face chars are from the page, they are not mine!)
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Old 2013-11-19, 03:29   #4
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Problem: for my latest P-1 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.
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Old 2013-11-19, 03:55   #5
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Hehe, did it give you 40 million GHzDays credit? (for that factorization of k, you are in that range, if I am not mistaken)
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Old 2013-11-19, 11:27   #6
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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.
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Old 2013-11-20, 11:50   #7
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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
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Old 2013-11-23, 16:33   #8
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Quote:
Originally Posted by markr View Post
Problem: for my latest P-1 factor (of M64369951) to find the factors of k I went to http://www.mersenne.ca/factor.php,
Let me introduce you to Factoris, which can factor integers (up to 20 seconds of CPU time) as well as rational numbers, polynomials and rational functions.

Last fiddled with by cheesehead on 2013-11-23 at 16:40
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Old 2013-11-25, 21:01   #9
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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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