20071222, 07:33  #34 
Mar 2006
Columbus, OH
1001101_{2} Posts 
I would like to reserve 706 for base 27 to at least n= 50k. I might continue working on it.
Steven 
20071223, 19:19  #35 
Sep 2004
UVic
70_{10} Posts 
7773*2^199784+1 is prime! Time: 213.884 sec.
i.e. 7773*16^49946+1 60145 digits I'll try my 6663 to 100K next Last fiddled with by gd_barnes on 20100516 at 07:12 
20071224, 03:14  #36  
May 2007
Kansas; USA
2882_{16} Posts 
Quote:
Quote:
Good find. Our first n > 25K for the effort! 56 k's to go base 16. Edit: I tried moving these into the new 'report primes here' thread that I just now created but it put them before the main post since they were written earlier. So I'll just leave them here. Please report all future primes in that thread...sorry that it wasn't created earlier. Gary Last fiddled with by gd_barnes on 20071224 at 03:53 

20071224, 15:44  #37 
Jan 2005
479 Posts 

20071224, 17:21  #38 
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  #39  
May 2007
Kansas; USA
2×5×17×61 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  #40 
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  #41  
May 2007
Kansas; USA
24202_{8} 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  #42 
Sep 2006
11×17 Posts 
Ah ok, thank you.
So I will just do k = 122 
20071225, 20:39  #43 
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  #44  
May 2007
Kansas; USA
2×5×17×61 Posts 
Quote:
Gary 

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