20130817, 23:58  #56  
Nov 2003
111000100110_{2} Posts 
The discussion about Top5000 cutoff moved to a new thread:
http://www.mersenneforum.org/showthread.php?t=18482 Quote:


20130818, 11:09  #57 
Jun 2003
Oxford, UK
2^{3}·241 Posts 
The candidate is perhaps the first as well with 100 primes known wearing its base 4 mask. Interestingly out of the 212 primes found, 119 are translatable to base 4, and only 93 not.
I have a hunch that the mismatch is not random. Base 4 is an extremely interesting base to analyse. It is the first square base, and resultant on that no prime p has modulo of p1. Generalised cunningham chains in square bases provide longer chains, and I think this is related to the last statement. 
20130818, 17:11  #58 
Feb 2003
1908_{10} Posts 
I stopped the sieve for n=8001000k at p=9.6T (which is more than optimal) and updated the zip file (22544.zip) in the top post.
Sieving n=1.032M is already in progress... 
20130818, 18:23  #59 
"Lennart"
Jun 2007
2^{5}×5×7 Posts 
Output logging to file pfgw.out
Primality testing 22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^5878331 [N+1, BrillhartLehmerSelfridge] Running N+1 test using discriminant 7, base 1+sqrt(7) Generic modular reduction using generic reduction AVX FFT length 60K, Pass1=320, Pass2=192 on A 587965bit number Calling BrillhartLehmerSelfridge with factored part 99.98% 22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^5878331 is prime! (2335.9659s+0.0007s) Lennart 
20130819, 15:18  #60 
"Antonio Key"
Sep 2011
UK
3^{2}×59 Posts 
630000635000 range completed  no primes.

20130819, 20:44  #61 
Nov 2004
California
2^{3}·3·71 Posts 
732740 complete, no primes

20130821, 00:06  #62 
"Lennart"
Jun 2007
10001100000_{2} Posts 
Primality testing 22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^5495981 [N+1, BrillhartLehmerSelfridge]
Running N+1 test using discriminant 7, base 1+sqrt(7) Generic modular reduction using generic reduction AVX FFT length 60K, Pass1=320, Pass2=192 on A 549730bit number Calling BrillhartLehmerSelfridge with factored part 99.98% 22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^5495981 is prime! (1954.0706s+0.0007s) Lennart 
20130821, 06:18  #63 
"Antonio Key"
Sep 2011
UK
531_{10} Posts 
Taking 740742

20130822, 06:18  #64 
"Lennart"
Jun 2007
2^{5}×5×7 Posts 
500,001600,000 Complete
4 Primes found Lennart 
20130822, 08:20  #65 
Jun 2003
Oxford, UK
2^{3}·241 Posts 

20130822, 20:18  #66 
Nov 2004
California
2^{3}×3×71 Posts 
Taking 742750

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Mersenne Primes p which are in a set of twin primes is finite?  carpetpool  Miscellaneous Math  3  20170810 13:47 
Distribution of Mersenne primes before and after couples of primes found  emily  Math  34  20170716 18:44 
Conjecture about Mersenne primes and nonprimes v2  Mickey1  Miscellaneous Math  1  20130530 12:32 
A conjecture about Mersenne primes and nonprimes  Unregistered  Information & Answers  0  20110131 15:41 
possible primes (real primes & poss.prime products)  troels munkner  Miscellaneous Math  4  20060602 08:35 