mersenneforum.org > News Holy new Mersenne prime, Batman! (M47 related)
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 2008-09-16, 19:44 #738 Housemouse     Feb 2008 25 Posts Jeff Sounds like Chicago Chicago record high 44C, record low -33C.
 2008-09-16, 19:58 #739 Batalov     "Serge" Mar 2008 Phi(4,2^7658614+1)/2 3×3,109 Posts perseverance pays off Congratulations to everyone! I found it interesting that the M_Sep was run (reserved) since January 19th. Sometime after March the number passed P-1; in the beginning of June there were first millions of iterations, so it shows that perseverance pays off! Or it can show how narrow the time margin for the prize really was. What is that computer was 25% faster per iteration (it looks like it was doing ~0.2s per iteration or so)? Anyway, Congratulations!
 2008-09-16, 20:03 #740 jrk     May 2008 3·5·73 Posts Yes, maybe he turned his computer off for a few weeks when he vacationed in the summer. Would that suck!!
2008-09-16, 20:12   #741
retina
Undefined

"The unspeakable one"
Jun 2006
My evil lair

2·3·1,013 Posts

Quote:
 Originally Posted by jrk Yes, maybe he turned his computer off for a few weeks when he vacationed in the summer. Would that suck!!
A \$50,000 vacation.

2008-09-16, 20:51   #742
ewmayer
2ω=0

Sep 2002
República de California

2·7·829 Posts

Quote:
 Originally Posted by jrk Yes, maybe he turned his computer off for a few weeks when he vacationed in the summer. Would that suck!!
The article in post #727 above says he only ran his PC 6-8 hours a day due to high electricity costs.

2008-09-16, 20:54   #743
ET_
Banned

"Luigi"
Aug 2002
Team Italia

10010110000002 Posts

Quote:
 Originally Posted by ewmayer The article in post #727 above says he only ran his PC 6-8 hours a day due to high electricity costs.
Someone is biting his hands...

Luigi

2008-09-16, 21:00   #744
Jeff Gilchrist

Jun 2003

100100100012 Posts

So it has been a busy day for me. Three interviews with papers, and also an interview on CBC Radio, which will be broadcast tonight on "As It Happens" a national wide program. I believe it is streamed online and will also be available afterwards as a downloadable file.

http://www.cbc.ca/asithappens/

This is the information I have from the producer:

Quote:
 Thanks for being a sport today. Your interview will be on at about 6:50 EDT tonight. It'll end while you are reciting the number. The second act of the number reading will be on at around 7:25 or so, and the finale will come at the very end of the show, just before 8:00. Keep listening until the very end. It's on at the same time in each time zone across Canada. Your American colleagues can listen live on-line in any time zone at www.cbc.ca/radio And you can find the audio on our site as of tomorrow at http://www.cbc.ca/asithappens/logs.html
I don't even remember what I said now so hopefully it all makes sense. They wanted me to read the number (well the very first part) so they are supposed to be mixing into the rest of the program just to stress how long it is. Hopefully that turns out well.

Jeff.

Last fiddled with by Jeff Gilchrist on 2008-09-16 at 21:02

2008-09-16, 21:09   #745
Wacky

Jun 2003
The Texas Hill Country

32×112 Posts

Quote:
 Originally Posted by Jeff Gilchrist They wanted me to read the number (well the very first part) so they are supposed to be mixing into the rest of the program just to stress how long it is.
Well, at 200 digits per minute, I calculate that it would take something like 45 DAYS to read just the digits without any breaks.

2008-09-16, 21:16   #746
M29

Dec 2003

22·41 Posts

Quote:
 Originally Posted by ixfd64 Here's an FAQ about M46, created by the man himself: http://www.math.ucla.edu/~edson/prime/
Q. Is this UCLA's first Mersenne Prime?

A. Actually, this is UCLA's eighth Mersenne Prime!

In 1952, Professor Raphael Robinson found 5 new Mersenne Primes using UCLA's Standards Western Automatic Computer (SWAC), one of the fastest computers of its time. These were the 13th through 17th Mersenne Primes discovered, and each had hundreds of digits. Robinson's Mersenne Primes were the first to be found in 75 years, and the first to be discovered using a digital computer.

In 1961, UCLA mathematician Alexander Hurwitz discovered the 19th and 20th Mersenne Primes on the UCLA Computer Center's IBM 7090 mainframe. Each of these numbers had over 1200 digits.

Now, 47 years later, the UCLA tradition of finding Mersenne Primes continues!

I graduated from CSU Fullerton, but spent my Freshman year at UCLA.

 2008-09-16, 22:07 #747 garo     Aug 2002 Termonfeckin, IE 3×919 Posts Ah now I spent many many years at UCLA getting my PhD. I didn't know Edson Smith but I probably passed by the laboratory where the prime was found many times. And I kid you not, my machine at UCLA was zeppelin.cs.ucla.edu - the machine that discovered the prime was zeppelin.pic.ucla.edu. Damn! So near yet so far... Last fiddled with by garo on 2008-09-16 at 22:09 Reason: Punctuation
 2008-09-16, 22:18 #748 garo     Aug 2002 Termonfeckin, IE 53058 Posts 37156667 passed through many hands before it went to the eventual discovered who as it has been noted took 8 months to finish the test. Here are the other unlucky ones who did know they were sitting on such a special treasure (the Mersenne prime bit not the 50k bit) Code: 37156667 * 67 67.7 -25.7 20.3 13-Dec-06 19:51 S549853 CAFCF4A69 37156667 * 67 42.1 15.9 45.9 14-Mar-07 08:42 GIMPSChina wonllu 37156667 * 67 52.9 -3.9 35.1 15-Jun-07 14:53 S649190 C436E103B 37156667 * 67 0.5 38.5 87.5 16-Sep-07 07:46 16-Sep-07 06:46 S694970 C92C25E4D 37156667 * 67 49.2 15.5 67.5 15-Oct-07 00:17 16-Sep-07 06:46 S694970 C3CFDF4F1 And here are excerpts showing its progress with hme2004 Code: 37156667 * 67 1 20.3 128.8 61.8 07-Feb-08 17:29 19-Jan-08 13:35 hme2004 rw 37156667 * 67 1 59.9 135.1 61.1 17-Mar-08 14:50 19-Jan-08 13:35 hme2004 rw 37156667 * 67 1 80.0 136.2 62.2 07-Apr-08 17:24 19-Jan-08 13:35 hme2004 rw 37156667 70 598911 130.9 33.3 60.3 26-May-08 19:59 19-Jan-08 13:35 hme2004 rw 37156667 70 20052928 184.9 10.2 60.2 19-Jul-08 15:14 19-Jan-08 13:35 hme2004 rw 43112609 has a relatively straightforward history. Assigned 14th July and completed 23rd August. But it too was assigned to someone else before UclaMath. Code: 43112609 * 68 40.8 12.2 20.2 18-Apr-08 15:35 S808839 43112609 69 7.5 31.5 80.5 20-Jul-08 19:36 14-Jul-08 23:33 UclaMath C20E3341C

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