Sierp base 16 - team drive #1 - Page 19

Mini-Geek · 2011-01-24, 12:29

R16 and S16 220K-230K complete, no primes. Results for both sides attached.

Mini-Geek · 2011-03-18, 23:19

Reserving 230K-240K.

Mini-Geek · 2011-03-26, 11:51

23682*16^232372+1=11841*2^929489+1 is prime! (279809 digits, will enter at rank ~796)

This was the highest weight S16 k, judging by the number of candidates in my range (it's beat out by one R16 k: 7673).
I haven't actually calculated the numbers for everything I've searched since then, but I have a feeling I was way 'overdue' (to use gambling fallacy terms) for a top-5K prime, with my last being found in June 2010. Now, most of my work since then hasn't been ideal for finding a top 5K prime, either too small to make the list or too large to have a good chance of finding a prime, but even so, I'm pretty sure I could have expected way over 1 top-5K prime in that time period.
This is the 4th largest prime I've found, and the largest I've found for CRUS.

mdettweiler · 2011-03-26, 17:18

Quote:

Originally Posted by Mini-Geek

23682*16^232372+1=11841*2^929489+1 is prime! (279809 digits, will enter at rank ~796)

This was the highest weight S16 k, judging by the number of candidates in my range (it's beat out by one R16 k: 7673).
I haven't actually calculated the numbers for everything I've searched since then, but I have a feeling I was way 'overdue' (to use gambling fallacy terms) for a top-5K prime, with my last being found in June 2010. Now, most of my work since then hasn't been ideal for finding a top 5K prime, either too small to make the list or too large to have a good chance of finding a prime, but even so, I'm pretty sure I could have expected way over 1 top-5K prime in that time period.
This is the 4th largest prime I've found, and the largest I've found for CRUS.

(Note: moved to S16 drive thread.)

That sounds a lot like the situation I've been in with top-5000 primes. The last one I found was from October 2010 on S6. In that time I had one quad on NPLB's port 9000 (on both the 5th and 6th drives at different points) for at least a month's total time, testing what I'm sure was more than 15,000 candidates over that, but could not get even one of those primes that are "supposed" to come every 10,000 candidates or so. (And then Chris puts his new i7, at roughly 2x my quad's output, on port 9000 recently and starts pulling out a regular 1-2 primes per week.

)

I've been hoping I'll do a bit better on port 1300 with the even/odd k/n base 2 stuff, but as usual I haven't found anything (again under what would be expected).

henryzz · 2011-03-26, 20:11

I had a pretty barren year last year finding only one top 5000 prime. I then found 3 primes in just january and february this year.

gd_barnes · 2011-03-30, 21:46

Congrats on a nice prime Tim!

A note to all: I have been sieving for about the last 3-4 weeks on all cores of my I7 on R16 & S16 all k's (was 39; now 38 k's) for n=250K-500K. Optimal sieve depth is P=~70T for the entire range. I will be at P=60T just as the NPLB rally starts on April 4th. At that point, there should be about a week worth of sieving left so ETA is ~April 18th-20th allowing a week break for the rally.

CRUS has kept the I7 very busy with sieving the last 2-3 months and will for nearly 2 more months. First it was R6 2 k's for n=1M-2M to P=180T. Then it was R2/S2 4 even k's for n=1M-2.5M to P=54T. Now it is R16/S16 38 k's for n=250K-500K to P=~70T. Finally it will be S6 18 k's for n=400K-1M to P=??. (likely P=~70T-100T) I'll be glad when the sieving is done but we well have plenty of work on the drives for a long time.

Gary

rogue · 2011-03-30, 22:37

Quote:

Originally Posted by gd_barnes

I'll be glad when the sieving is done but we well have plenty of work on the drives for a long time.

I hope not!

Wouldn't it be nicer to relatively quickly find the primes needed?

I know that is unlikely, but one can always hope.

Of course, you know my opinion of setting up a PRPNet or LLRNet server for distributing the PRP work...

Mini-Geek · 2011-04-20, 23:56

16015*16^239758+1=16015*2^959032+1 is prime!
I certainly picked a lucky range! That's the third prime in a range (considering Riesel and Sierp as one) that I could have expected just 0.45 primes. If I'm doing my math right, there was only a 1.094% chance that I'd find 3 or more primes in the range. I think that just might make up for my recent drought!

Too bad it can't be used as a predictor of future performance (or can it? Hmm...probably not).
16015 was another very high-weight k. Too bad I'm not knocking out the low-weight ones, which will probably stick around for a long time.

MyDogBuster · 2011-04-21, 00:32

Quote:

Too bad I'm not knocking out the low-weight ones, which will probably stick around for a long time.

But your knocking out lots of candidates so keep up the good work Tim.

gd_barnes · 2011-04-21, 05:34

Quote:

Originally Posted by Mini-Geek

16015*16^239758+1=16015*2^959032+1 is prime!
I certainly picked a lucky range! That's the third prime in a range (considering Riesel and Sierp as one) that I could have expected just 0.45 primes. If I'm doing my math right, there was only a 1.094% chance that I'd find 3 or more primes in the range. I think that just might make up for my recent drought!

Too bad it can't be used as a predictor of future performance (or can it? Hmm...probably not).
16015 was another very high-weight k. Too bad I'm not knocking out the low-weight ones, which will probably stick around for a long time.

Nice! Congrats again Tim.

Mini-Geek · 2011-04-21, 11:03

230K-240K complete, 2 primes, results in Riesel thread.
Reserving 240K-250K.

2011-03-26, 11:51	#201
Mini-Geek Account Deleted "Tim Sorbera" Aug 2006 San Antonio, TX USA 17·251 Posts	2368216^232372+1=118412^929489+1 is prime! (279809 digits, will enter at rank ~796) This was the highest weight S16 k, judging by the number of candidates in my range (it's beat out by one R16 k: 7673). I haven't actually calculated the numbers for everything I've searched since then, but I have a feeling I was way 'overdue' (to use gambling fallacy terms) for a top-5K prime, with my last being found in June 2010. Now, most of my work since then hasn't been ideal for finding a top 5K prime, either too small to make the list or too large to have a good chance of finding a prime, but even so, I'm pretty sure I could have expected way over 1 top-5K prime in that time period. This is the 4th largest prime I've found, and the largest I've found for CRUS. Last fiddled with by Mini-Geek on 2011-03-26 at 11:55

2011-04-20, 23:56	#206
Mini-Geek Account Deleted "Tim Sorbera" Aug 2006 San Antonio, TX USA 17·251 Posts	1601516^239758+1=160152^959032+1 is prime! I certainly picked a lucky range! That's the third prime in a range (considering Riesel and Sierp as one) that I could have expected just 0.45 primes. If I'm doing my math right, there was only a 1.094% chance that I'd find 3 or more primes in the range. I think that just might make up for my recent drought! Too bad it can't be used as a predictor of future performance (or can it? Hmm...probably not). 16015 was another very high-weight k. Too bad I'm not knocking out the low-weight ones, which will probably stick around for a long time. Last fiddled with by Mini-Geek on 2011-04-21 at 00:30

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2011-03-18, 23:19	#200
Mini-Geek Account Deleted "Tim Sorbera" Aug 2006 San Antonio, TX USA 17×251 Posts	Reserving 230K-240K.

2011-03-26, 20:11	#203
henryzz Just call me Henry "David" Sep 2007 Cambridge (GMT/BST) 5,881 Posts	I had a pretty barren year last year finding only one top 5000 prime. I then found 3 primes in just january and february this year.

2011-03-30, 21:46	#204
gd_barnes May 2007 Kansas; USA 101·103 Posts	Congrats on a nice prime Tim! A note to all: I have been sieving for about the last 3-4 weeks on all cores of my I7 on R16 & S16 all k's (was 39; now 38 k's) for n=250K-500K. Optimal sieve depth is P=~70T for the entire range. I will be at P=60T just as the NPLB rally starts on April 4th. At that point, there should be about a week worth of sieving left so ETA is ~April 18th-20th allowing a week break for the rally. CRUS has kept the I7 very busy with sieving the last 2-3 months and will for nearly 2 more months. First it was R6 2 k's for n=1M-2M to P=180T. Then it was R2/S2 4 even k's for n=1M-2.5M to P=54T. Now it is R16/S16 38 k's for n=250K-500K to P=~70T. Finally it will be S6 18 k's for n=400K-1M to P=??. (likely P=~70T-100T) I'll be glad when the sieving is done but we well have plenty of work on the drives for a long time. Gary

2011-04-21, 11:03	#209
Mini-Geek Account Deleted "Tim Sorbera" Aug 2006 San Antonio, TX USA 17×251 Posts	230K-240K complete, 2 primes, results in Riesel thread. Reserving 240K-250K.