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Old 2009-05-10, 14:21   #485
IronBits
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Added 88172 : 1865*2^622146-1 (187288 digits)
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Old 2009-05-10, 14:47   #486
gd_barnes
 
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It seems only fitting that one of the most prolific k's and one of our largest searchers should find the prime that ties RPS for 1st place on # of primes!! (when IronBit's last prime and this one are added in)

LaurenU2 found:

1875*2^622639-1 is prime

This is the 7th top-5000 prime found by NPLB for this k and the 44th by Lauren in the short time that he has crunched for us.

Before celebrating too much, though, we are due to drop off 3 primes within the next 10-11 that are submitted by all projects vs. none for RPS for the next 30 so even if we take a temporary lead, we're likely to fall back for a short period. No problem, we'll quickly take back over the lead for good until PrimeGrid ultimately catches us. The good news is that we may have more than one person give us the tie and more than one person to give us a lead that we permanently keep. :-)


Gary

Last fiddled with by gd_barnes on 2009-05-10 at 14:48
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Old 2009-05-10, 15:14   #487
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Quote:
Originally Posted by gd_barnes View Post
It seems only fitting that one of the most prolific k's and one of our largest searchers should find the prime that ties RPS for 1st place on # of primes!! (when IronBit's last prime and this one are added in)

LaurenU2 found:

1875*2^622639-1 is prime

This is the 7th top-5000 prime found by NPLB for this k and the 44th by Lauren in the short time that he has crunched for us.

Before celebrating too much, though, we are due to drop off 3 primes within the next 10-11 that are submitted by all projects vs. none for RPS for the next 30 so even if we take a temporary lead, we're likely to fall back for a short period. No problem, we'll quickly take back over the lead for good until PrimeGrid ultimately catches us. The good news is that we may have more than one person give us the tie and more than one person to give us a lead that we permanently keep. :-)


Gary


Much thanks to all of our searchers who helped us accomplish this long before we originally had expected!

Last fiddled with by mdettweiler on 2009-05-10 at 15:15
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Old 2009-05-10, 15:16   #488
Flatlander
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That's a fantastic achievement. Well done all!
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Old 2009-05-10, 16:18   #489
henryzz
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Quote:
Originally Posted by Flatlander View Post
That's a fantastic achievement. Well done all!
brilliant achievement

like your new avatar Flatlander
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Old 2009-05-11, 11:00   #490
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Like I warned in the post, don't celebrate so fast guys. We achieved the tie for all of about 15 mins. before a couple of ours dropped off and RPS submitted a couple to put us 4 back. I just now submitted one for Lauren but even with that one, we're still 7 back.

I'll be able to tell when a tie or lead should be permanent. It may be several days yet and is also based upon the # of primes below ~4970th place. When the lead becomes permanent is when we should celebrate! :-)

Edit: I just checked. Before Lauren's prime was added, we had primes in 4997th, 4998th, and 4999th place so we'll be quickly dropping 3 off. After that, we're clean all the way until 4880th place. For RPS, they will drop off 4 between 4977th and 4995th place likely within the next couple of days. After that, they're clean until 4884th place. With primes dropping off becoming a non-factor after the next couple of days likely for up to a week, everything should be easy to figure at that point.

The fftlen change on the 10th drive is making finding primes take quite a bit longer. I have now applied all of the factors from the sieving drive up to P=45T to the sieved file. I'll have David stop the server, delete the pairs where n>630000, and reload the better sieved file in after that. With about 2% of the k/n pairs removed for the recent grouping of P=25T-45T factors, although testing times will remain the same, finding primes should speed up by 2% since we'll be testing fewer composites. That's chump change compared to the about ~15% longer that the tests are now taking but every little bit helps as the n-ranges get larger.


Gary

Last fiddled with by gd_barnes on 2009-05-11 at 11:23
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Old 2009-05-11, 11:06   #491
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LaurenU2 found:

1731*2^623847-1 is prime
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Old 2009-05-11, 13:17   #492
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1435*2^624793-1 New Prime
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Old 2009-05-11, 15:39   #493
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Quote:
Originally Posted by gd_barnes View Post
The fftlen change on the 10th drive is making finding primes take quite a bit longer.
it would be nice to always have a top-5000 drive that is below this fftlen change
obviously at some point we would have to increase that marker to the next fftlen change
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Old 2009-05-12, 12:38   #494
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Quote:
Originally Posted by henryzz View Post
it would be nice to always have a top-5000 drive that is below this fftlen change
obviously at some point we would have to increase that marker to the next fftlen change
See the new NPLB future direction thread.
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Old 2009-05-12, 12:39   #495
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LaurenU2 found:

1437*2^627580-1 is prime
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