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 2012-10-09, 04:06 #1 LaurV Romulan Interpreter     Jun 2011 Thailand 23A916 Posts 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
 2012-10-09, 04:14 #2 Dubslow Basketry That Evening!     "Bunslow the Bold" Jun 2011 40
 2013-11-02, 17:21 #3 LaurV Romulan Interpreter     Jun 2011 Thailand 100011101010012 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. (the colors and bold face chars are from the page, they are not mine!)
 2013-11-19, 03:29 #4 markr     "Mark" Feb 2003 Sydney 3×191 Posts 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.
 2013-11-19, 03:55 #5 LaurV Romulan Interpreter     Jun 2011 Thailand 3·17·179 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)
 2013-11-19, 11:27 #6 markr     "Mark" Feb 2003 Sydney 57310 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.
 2013-11-20, 11:50 #7 markr     "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
2013-11-23, 16:33   #8

"Richard B. Woods"
Aug 2002
Wisconsin USA

1E0C16 Posts

Quote:
 Originally Posted by markr 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

 2013-11-25, 21:01 #9 markr     "Mark" Feb 2003 Sydney 23D16 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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