20071224, 17:21  #34 
Sep 2006
11×17 Posts 
1 or 2 months ago, I started Sierpinski, Base 18.
Think, I will continue this search. k = 122 Sieved till 4P (can anyone tell me, how to calculate the optimal sieve depth?) LLR till n=128000 
20071224, 19:30  #35  
May 2007
Kansas; USA
10520_{10} Posts 
Quote:
Quick question...Have you already LLR'd until n=128000 or is that how far you are going to LLR it in the future? You should sieve until the rate at which candidates are being removed approximately equals the rate at which they can be LLR'd. To be very specific, you should do an LLR test of ONE candidate that is at 70% of the nrange that you are sieving and sieve until the removal rate equals that testing time. So if you are sieving n=100K200K, you should run an LLR test on a candidate around n=170K (one that already has small factors removed). However long that takes to LLR is the removal rate you should sieve to. Sieving to P=4P (same as P=4000T if I remember correctly) sounds a bit high but I don't know what range of n you are sieving. Any more questions...just ask. Everyone's quite helpful around here. Gary 

20071225, 16:20  #36 
Sep 2006
11×17 Posts 
Hi,
yes, I have already LLR'd to n = 130000, and I will try to do it, until I find a prime ;) I sieved till n = 1,000,000. At the moment, I get a rate of 20 minutes per factor, and I need about half an hour per LLR test. So I think, I can continue sieving a while. Ok, thank you. Edit: Another question. When I started Sierpinski Base 18, I was told that there are three more k: 18, 324 and 381. For 381 I found a prime  but what is with 18 and 324? There were some "problems", because the k = base, but don't we need to find a prime here, too? Last fiddled with by Xentar on 20071225 at 16:25 
20071225, 16:48  #37  
May 2007
Kansas; USA
2^{3}·5·263 Posts 
Quote:
We will take up the issue of multiples of the base after the project has been going for a month or two. Thanks, Gary 

20071225, 16:59  #38 
Sep 2006
BB_{16} Posts 
Ah ok, thank you.
So I will just do k = 122 
20071225, 20:39  #39 
A Sunny Moo
Aug 2007
USA (GMT5)
3·2,083 Posts 
Woo hoo! I found a prime! And it's my first prime ever!
I don't think it qualifies for top5000 status, but here's what I found in my lresults.txt file today as a nice little Christmas present: 4885*2^243388+1 is prime! This prime is equivalent to 4885*16^60847+1; this means that k=4885 has been eliminated for Sierpinski Base 16! k=4885 has been searched up to n=60973; it went a little over since I didn't notice the prime until a few more candidates for that k had been tested. I am unreserving k=4885; the remaining sieved candidates (up to n=100,000) are attached to this post in case anyone wants to search this k further. Also included in the archive attached to this post are the residuals for both k=2908 and k=4885 up to n=60973 (for k=4885) and n=61188 (for k=2908). I am still searching k=2908. Last fiddled with by gd_barnes on 20100516 at 07:13 
20071226, 03:16  #40  
May 2007
Kansas; USA
10100100011000_{2} Posts 
Quote:
Gary 

20071226, 03:46  #41 
May 2007
Kansas; USA
2^{3}·5·263 Posts 

20071226, 17:08  #42 
May 2007
Kansas; USA
2^{3}×5×263 Posts 
Sierp base 12 and Riesel base 13 update
Status from Carlos (em99010pepe):
404*12^n+1 is complete to n=79.6K. He decided not to test 288*13^n1 so that one is now available. It had already been tested to n=62K and a sieved file is available in the sieving thread up to n=100K. Gary 
20071226, 19:51  #43 
Oct 2006
103_{16} Posts 
32673*2^101924+1 is prime! Time: 51.669 sec.
or 32673*16^25481+1 
20071226, 20:45  #44  
May 2007
Kansas; USA
2918_{16} Posts 
Quote:
Are you searching any more k's right now? If so, I'll show them reserved by you to keep any doublework from happening. Also, if you want a file sieved to P=400G on any k that you're interested in for Sierp base 16, I can send it to you ~1011 PM today CST US (45 AM Thurs. GMT) after our big sieve is done to that point. Thanks for searching. Gary Last fiddled with by gd_barnes on 20071226 at 20:50 

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