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Old 2008-05-08, 22:53   #45
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312,988 digits. equiv. to ~2^1035000. Congrats!
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Old 2008-05-08, 22:58   #46
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Quote:
Originally Posted by gd_barnes View Post
You must have had some serious firepower going after that one. I only showed you at n=200K as of April 24th!
I split the range over a few CPUs. I started one at n=300000 on Monday and the PRP was found later that day. Apparently PFGW is having a problem with the proof. I'm getting the error "Unknown error in PFGW runtime. Possibly a number too big for alloca version of GMP". I had to start the proof on an older version.

BTW, all base 28 k (Sierpinski) are tested to n = 100,000. I made a mistake and did not test the base 28 Riesels. You can unreserve them. I will reserve the Sierpinski and Riesel base 27 k.

Last fiddled with by rogue on 2008-05-08 at 23:16
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Old 2008-05-09, 01:40   #47
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958*11^300544+1 has been verified as prime by PFGW.
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Old 2008-05-09, 04:08   #48
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Quote:
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958*11^300544+1 has been verified as prime by PFGW.
AMAZING and congrats again on a monster prime!!

I believe this will move CRUS into 12th place on primes found (from 14th) and move it into 18th place on score (from 20th). I just now looked and the score on it is 33.11! Whew! :-)

BTW, what was your optimal sieve depth for this? It must have been very high although I don't know what its weight is.


Gary

Last fiddled with by gd_barnes on 2008-05-09 at 04:13 Reason: Corrected place on top-5000 and score
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Old 2008-05-09, 04:55   #49
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One more interesting note on Rogue's Sierp base 11 proof: With a conjectured value of k=1490, it is the highest conjecture that has been proven to date for either side by any project. The previous highest was Sierp base 21 at k=1002.

The next challenge: What's the highest conjecture that we only have ONE k remaining on? By far, it is Sierp base 10 with a conjecture of k=9175. It has only k=7666 remaining at n=195K.

Anyone care to tackle Sierp base 10?


Gary
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Old 2008-05-09, 12:22   #50
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Quote:
Originally Posted by gd_barnes View Post
AMAZING and congrats again on a monster prime!!

I believe this will move CRUS into 12th place on primes found (from 14th) and move it into 18th place on score (from 20th). I just now looked and the score on it is 33.11! Whew! :-)

BTW, what was your optimal sieve depth for this? It must have been very high although I don't know what its weight is.

Gary
I had sieved to 4e12 and was on my way to sieving to 1e13. I was sieving on
one computer and doing PRP testing on 3 others.
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Old 2008-05-09, 21:30   #51
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Quote:
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I had sieved to 4e12 and was on my way to sieving to 1e13. I was sieving on
one computer and doing PRP testing on 3 others.
Very good. One more question: How long did it take Phrot to find the probable prime? I'd be curious to compare it to LLR or PFGW for probable prime testing.


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Old 2008-05-09, 21:52   #52
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Quote:
Originally Posted by gd_barnes View Post
Very good. One more question: How long did it take Phrot to find the probable prime? I'd be curious to compare it to LLR or PFGW for probable prime testing.

Gary
On a PowerPC G5 at 2.5 Ghz, it took 9900 seconds (as from my original post on the subject). The verification took 7900 seconds on a 2.4 Ghz Core 2 Duo. I was rather surprised by that because I expected verification to take longer as verification of primes in other bases has taken much longer.
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Old 2008-07-12, 08:28   #53
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I have added links to sieved files for Riesel and Sierp bases 22 and 23 (4 bases total) to the reservations web pages. 3 of the 4 files are sieved past P=5T and the other at P=~3.5T.

The files go from n=100K-1M on most of the k's. The P=5T files should be nearly sufficiently sieved if you plan on testing to only n=200K. Past that, they'll need more sieving. Warning: Taking any of these bases to only n=200K is a large amount of work unless you find primes quickly.

Thanks for the excellent sieving KEP!


Gary

Last fiddled with by gd_barnes on 2008-07-12 at 08:30
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Old 2008-07-12, 09:18   #54
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Quote:
Originally Posted by gd_barnes View Post
I have added links to sieved files for Riesel and Sierp bases 22 and 23 (4 bases total) to the reservations web pages. 3 of the 4 files are sieved past P=5T and the other at P=~3.5T.

The files go from n=100K-1M on most of the k's. The P=5T files should be nearly sufficiently sieved if you plan on testing to only n=200K. Past that, they'll need more sieving. Warning: Taking any of these bases to only n=200K is a large amount of work unless you find primes quickly.

Thanks for the excellent sieving KEP!


Gary
Your very welcome. The Sierp Base 19 has just been sent to you. With ~3.6 million pairs left to test. Sieve demand using sr2sieve is ~640MB of RAM. I'm going to start soon on working the huge log files for n<=500 for Riesel Base 3, after that I'll send you on e-mail all the PRPs found, before sieving them to n<=25000.

Regards

KEP
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Old 2008-07-28, 07:44   #55
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Come check out the new mini drive for Sierp base 3 here!
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