20200902, 13:18  #188 
"Dylan"
Mar 2017
2^{4}·3·11 Posts 
Range is complete:
Code:
no factor for k*2^74+1 in k range: 8000000000000000 to 9007199254740991 (127bit factors) [mmff 0.28 mfaktc_barrett128_F64_95gs] no factor for k*2^74+1 in k range: 9007199254740992 to 10000000000000000 (128bit factors) [mmff 0.28 mfaktc_barrett128_F64_95gs] 
20201002, 13:47  #189 
Feb 2019
7×11 Posts 
I have processed half of the range. PRPs for n=1800018499, k=2e65e6 are attached. Found one xGF so far:
Code:
3796269*2^18431+1 is a Factor of xGF(18430,12,7)!!!! 
20201003, 10:24  #190  
Banned
"Luigi"
Aug 2002
Team Italia
1001010100011_{2} Posts 
Quote:
Once you finish the range, please attach the full list of factors found, and I will send it to Prof Keller. Last fiddled with by ET_ on 20201003 at 10:24 

20201115, 14:39  #191 
"Dylan"
Mar 2017
2^{4}×3×11 Posts 
Taking the following gaps, to test with gfndsieve + pfgw with the gx flag:
n: 8000180999, k: 25e430e4 n: 9000190999, k: 20e425e4 
20201117, 19:07  #192 
Feb 2019
1001101_{2} Posts 
Hi,
I finished the range n=18k19k, k=2M5M and found 2 xGF divisors: 3796269*2^18431+1 is a Factor of xGF(18430,12,7)!!!! 2130243*2^18749+1 is a Factor of xGF(18746,7,5)!!!! A list of all prps I've found is in the attached zip file. 
20201119, 15:43  #193 
"Matthew Anderson"
Dec 2010
Oregon, USA
623_{10} Posts 
Reserving
FermatFactor=36,700e15,900e15 This should take me several months. Matt 
20201119, 17:12  #194  
Banned
"Luigi"
Aug 2002
Team Italia
13·367 Posts 
Quote:
Should we reserve just one big chunk for 815e15<k<900e15? Luigi Last fiddled with by ET_ on 20201119 at 17:12 

20201120, 03:04  #195 
"Matthew Anderson"
Dec 2010
Oregon, USA
1001101111_{2} Posts 
Luigi, I say you just reserve one big chunk. That makes bookkeeping easier.
I plan on reporting results every few weeks. Should we reserve just one big chunk for 815e15<k<900e15? Yes Regards, Matt Anderson 
Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Reservations  ET_  Operazione Doppi Mersennes  493  20201119 17:36 
Reservations  kar_bon  Riesel Prime Data Collecting (k*2^n1)  129  20160905 09:23 
Reservations?  R.D. Silverman  NFS@Home  15  20151129 23:18 
Reservations  R.D. Silverman  Cunningham Tables  15  20110304 21:01 
45M Reservations  paulunderwood  3*2^n1 Search  15  20080608 03:29 