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 2008-09-16, 22:46 #749 ixfd64 Bemusing Prompter     "Danny" Dec 2002 California 23×33×11 Posts Here's another article from Scientific American: http://www.sciam.com/blog/60-second-...-cl-2008-09-16
2008-09-16, 22:53   #750
ATH
Einyen

Dec 2003
Denmark

22·769 Posts

Quote:
 Originally Posted by akruppa Not unexpectedly, they are not a part of a twin prime pair and don't disprove the NMC. 5^2*859 | 2^37156667-3 297253337 | 2^37156667+1 191 | 2^43112609-3 86225219*5259738299*5949540043*12482997260297 | 2^43112609+1 Congrats everyone! Alex
No need to check 2^p+1 ? :) Since it would have to be a fermat prime.

Perfectnumbers+1 are not prime either:

p=37156667: 2^(p-1)*(2^p-1)+1 factors: 7,11,44753,202577,1282451377
p=43112609: 2^(p-1)*(2^p-1)+1 factors: 7,211,70121,71647,1846524311
checked up to 10^10.

2008-09-16, 22:55   #751
ATH
Einyen

Dec 2003
Denmark

22×769 Posts

Quote:
 Originally Posted by R.D. Silverman It would be nice, from a mathematical point of view, if GIMPS were to stop looking for NEW primes (now that we have a prime > 10M digits) and instead were to work on filling in the GAPS.
I would like to finish the gaps too, but thats considered "poaching", since old slow computers working on low first time numbers. If someone decides something, I'm interested.

Last fiddled with by ATH on 2008-09-16 at 22:55

2008-09-16, 23:47   #752
Damian

May 2005
Argentina

2·3·31 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.
He was amazingly unlucky given he has been amazingly lucky.

Does that makes any sense?

2008-09-17, 00:20   #753
ATH
Einyen

Dec 2003
Denmark

22×769 Posts

Quote:
 Originally Posted by akruppa 5^2*859 | 2^37156667-3 297253337 | 2^37156667+1 191 | 2^43112609-3 86225219*5259738299*5949540043*12482997260297 | 2^43112609+1
3 | 2^37156667+1
3 | 2^43112609+1

Actually operating modulo 3:
2odd+1 = 2*2even+1 = 2*(2^2)even/2+1 = 2*1even/2+1 = 0 (mod 3)

Last fiddled with by ATH on 2008-09-17 at 00:20

 2008-09-17, 01:02 #754 jinydu     Dec 2003 Hopefully Near M48 33368 Posts The first known million digits prime was discovered on June 1, 1999. The $50,000 EFF prize was awarded on April 6, 2000, 310 days later. At that rate, the$100,000 EFF prize will be awarded on June 29, 2009. Does anyone know when the M38 discovery was published and in what journal?
 2008-09-17, 01:30 #755 argilo   Aug 2008 Ottawa, Canada 7 Posts Listen to Jeff Gilchrist! For those interested in hearing the interview with Jeff Gilchrist, go to http://www.cbc.ca/radio/ and click on the "Pacific" link beside "Listen Live - Radio One". Jeff will be on approximately 20 minutes from now.
 2008-09-17, 01:49 #756 Batalov     "Serge" Mar 2008 Phi(4,2^7658614+1)/2 41·229 Posts Great show, Jeff! I've listened to the whole number... (rewound all the other stuff though) "...you can continue now..." Very nice! Thanks! P.S. I guess I have a time machine! Nah, I rented it from CBC... just go to http://www.cbc.ca/asithappens/latestshow.html and use all three parts. The marker for the 1st part would be about 22:00 into the part, then ~15:30 into the 2nd part and the very end of part III. Last fiddled with by Batalov on 2008-09-17 at 01:58
 2008-09-17, 01:50 #757 argilo   Aug 2008 Ottawa, Canada 710 Posts One minute until Jeff's segment. (See listening instructions in my previous post.)
 2008-09-17, 02:09 #758 ixfd64 Bemusing Prompter     "Danny" Dec 2002 California 23×33×11 Posts In case anyone hasn't seen my post in the other thread, I've started an article on Wikinews: http://en.wikinews.org/wiki/Two_larg...or_\$100k_prize Feel free to improve it, but please make sure it's accurate! Last fiddled with by ixfd64 on 2008-09-17 at 02:09
2008-09-17, 02:29   #759
jinydu

Dec 2003
Hopefully Near M48

6DE16 Posts

Quote:
 Originally Posted by jinydu Does anyone know when the M38 discovery was published and in what journal?
Never mind, I think I found it. "On the Discovery of the 38th Known Mersenne Prime" by George Woltman. It is on page 367 of Volume 37.4, November 1999 issue, of the Fibonacci Quarterly.

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