20070109, 00:35  #1 
"Mark"
Apr 2003
Between here and the
2^{3}×5×7×23 Posts 
Sierpinski/Riesel Base 10
The Sierpinksi value for base 10 is 9175.
The Riesel value for base 10 is 10176. Primes need to be found for the following n to prove the conjecture. 5028*10^n+1 7666*10^n+1 1803*10^n1 1935*10^n1 4421*10^n1 7019*10^n1 8579*10^n1 All are tested to n=50000. (all reserved for rogue) primes found so far: 8194*10^21129+1 (rogue) 1343*10^297111 (rogue) 1803*10^458821 (rogue) 7404*10^44826+1 (rogue) 1935*10^518361 (rogue) 6665*10^602481 (rogue) 5028*10^83982+1 (rogue) Last fiddled with by michaf on 20070202 at 16:26 
20070122, 19:39  #2 
Jan 2005
479 Posts 
Wow :)
Congratulations! (Is there even a provercode for phrot yet?) 
20070122, 21:52  #3 
"Mark"
Apr 2003
Between here and the
2^{3}·5·7·23 Posts 
Phil is in the process of creating one, but the Prime Pages is very slow today.

20070122, 23:05  #4  
May 2003
11100111_{2} Posts 
Quote:
Yes, you may infer that I intend to put primality proving into the programs eventually. However, that's further down the road. Until then *use PFGW for proofs*. The short code for it is 'PPP', and Professor Caldwell will mark it as a program rather than a human anon, so don't worry if it looks like a human presently. The prime pages looks fixed too  slick as a greased eel. Many congrats Mark! Last fiddled with by fatphil on 20070122 at 23:07 Reason: adding comment about prime pages' speed 

20070127, 13:27  #5 
"Mark"
Apr 2003
Between here and the
2^{3}×5×7×23 Posts 
Completed to 100000 and continuing...

20070226, 00:26  #6 
"Mark"
Apr 2003
Between here and the
14450_{8} Posts 
I've been sidetracked for a while on other more pressing problems that require my CPU. I had started sieving these k, but discontinued. These are free for anyone else to work on. If you are interested in the sr10data.txt file, PM me and I'll send it to you.

20070522, 00:11  #7 
"Jason Goatcher"
Mar 2005
3×7×167 Posts 
Do you still have these files? If not, can you tell me how far you got with LLR?
Note: I'm going to post this, or something similar in all these types of threads. Whether I work on individual ones or not, I think it's a bad idea to leave progress reports open ended. Last fiddled with by jasong on 20070522 at 00:13 
20070522, 02:46  #8 
"Mark"
Apr 2003
Between here and the
2^{3}×5×7×23 Posts 
I'm PRP testing right now. I've gone to about 140,000 with no primes. I'll post a file tomorrow.

20071118, 02:25  #9  
May 2007
Kansas; USA
5^{2}×421 Posts 
Web page of known k's and primes for k*10^n1
Quote:
I have some questions that will help me keep the data accurate: 1. Which k's of the k*10^n1 form that you have searched to n=140,000? 2. I show that the only k's remaining to find a prime below the lowest Riesel k=10176 are k=4421, 7019, and 8579. Is that correct? (I'm also guessing that those are the k's you've tested to n=140,000.) 3. Do you know of any other Riesel k's base 10 and their covering sets of factors for k>10176? Also, if you can spare a few mins., would you mind checking my page for a few of the k's that you have searched, their primes and ranges? That would help me greatly. I have included all known info. from several souces on the page (shown at the bottom including you as a contributor) as well as plenty of add'l. info. from ranges that I have searched. Thank you, Gary 

20071118, 05:09  #10  
"Mark"
Apr 2003
Between here and the
6440_{10} Posts 
Quote:


20071118, 07:12  #11 
May 2007
Kansas; USA
24435_{8} Posts 
OK, thanks for the update. I have updated the page to show your 3 Riesel k's=4421, 7019, & 8579 tested to n=195K.
k=7666 is for Proth's base 10 per your original post in this thread. It is also 1 mod 3. I'm only showing Riesel's base 10. This means I don't show any k's that are 1 mod 3 where all n's are divisible by 3 and of course no k's that are 0 mod 10, which can be reduced. Gary 
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