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Old 2008-09-16, 22:46   #749
ixfd64
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Here's another article from Scientific American: http://www.sciam.com/blog/60-second-...-cl-2008-09-16
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Old 2008-09-16, 22:53   #750
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Quote:
Originally Posted by akruppa View Post
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.
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Old 2008-09-16, 22:55   #751
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Quote:
Originally Posted by R.D. Silverman View Post
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
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Old 2008-09-16, 23:47   #752
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Quote:
Originally Posted by ewmayer View Post
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?
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Old 2008-09-17, 00:20   #753
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Quote:
Originally Posted by akruppa View Post
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
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Old 2008-09-17, 01:02   #754
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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?
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Old 2008-09-17, 01:30   #755
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Default 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.
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Old 2008-09-17, 01:49   #756
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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
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Old 2008-09-17, 01:50   #757
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One minute until Jeff's segment. (See listening instructions in my previous post.)
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Old 2008-09-17, 02:09   #758
ixfd64
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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
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Old 2008-09-17, 02:29   #759
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Quote:
Originally Posted by jinydu View Post
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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