20160519, 01:58  #45 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
2·5·983 Posts 

20160519, 03:57  #46  
"Rashid Naimi"
Oct 2015
Remote to Here/There
2·19·59 Posts 
Quote:
I have 19.lc registered. Choose a subdomain as short as you would like and I will set it up. Notes: * I can not guarantee a delivery time * I can not guarantee duration of service So if interested please let me know and make sure you have backups. 

20160519, 12:46  #47 
"Mark"
Apr 2003
Between here and the
2^{3}×3×5^{2}×11 Posts 
Thanks for your suggestions. MIke (Xyzzy) has offered me space here at mersenneforum, which is the best of all worlds. I had considered prothsearch, but I don't own the domain and with Ray being gone and Wilfred getting older, I don't know how much longer that domain will be around. Also, most of the work is being done by PrimeGrid, so I have been considering locking users from making reservations.
Last fiddled with by rogue on 20160519 at 12:47 
20160519, 13:37  #48 
Jul 2003
1001100110_{2} Posts 
hi,
here are the results for carol / kynea b=66, n=1000 to 30000 (66^1751+1)^22 (66^19021)^22 (66^9832+1)^22 (66^28522+1)^22 b=68, n=1000 to 30000 (68^22721)^22 (68^26341)^22 (68^2960+1)^22 (68^3014+1)^22 (68^165221)^22 
20160519, 18:06  #49 
I moo ablest echo power!
May 2013
2^{2}·449 Posts 
For b=26, no new primes through n=50k. Continuing on to n=100k.

20160519, 21:12  #50 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
2·5·983 Posts 
For b=688, (688^10160+1)^22 is prime!
For b<=2000, only b=640 and b=1656 remain without known primes. I reserve b=1656 to n<=20000 and release b=688 at n=11000. 
20160521, 18:28  #51 
Sep 2002
Database er0rr
2^{4}×7×37 Posts 
top5000
Congrats Serge for finding the near square prime (178^87525  1)^2  2 with 393937 decimal digits!
Last fiddled with by paulunderwood on 20160521 at 18:29 
20160521, 19:41  #52  
"Mark"
Apr 2003
Between here and the
2^{3}×3×5^{2}×11 Posts 
Quote:
Thanks Serge and congrats. 

20160522, 01:05  #53 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
10011001100110_{2} Posts 
Sometime last week I've thought about attacking a recordable (Top5000) CK prime.
I've sieved b=10, 20, 30, 40 far enough, but altogether they didn't have enough sub1hour candidates after sieve to warrant a success (After a certain size candidates start taking more than an hour each, and then quickly 1.5 then 2 hours.) So to bridge the path to certain success, I additionally sieved 102<=b<=202 (but not powers) to 1e11  for a small slice just above 389K decimal digits. Then for technical reasons I chose only 36 thickest bases and sieved them up to 2e12. Then I merged all files and sorted by size and started ~ a hundred PFGW instances. This morning a prime popped up for b=178. I will test through the weekend, then stop, and will post all tested ranges explicitly; they can be added to control tables in square brackets as some Proth and Riesel tables on certain sites are recorded. 
20160523, 00:53  #55 
Sep 2002
Database er0rr
2^{4}·7·37 Posts 
Congrats

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