20130925, 01:11  #936 
May 2010
Prime hunting commission.
1680_{10} Posts 
Bumping:
200662*37^{16450}+1 (25803 digits) Primality testing 200662*37^16450+1 [N1, BrillhartLehmerSelfridge] Running N1 test using base 7 Special modular reduction using zeropadded AMD K10 type0 FFT length 10K, Pass1=40, Pass2=256 on 200662*37^16450+1 Calling BrillhartLehmerSelfridge with factored part 99.98% 200662*37^16450+1 is prime! (22.7424s+0.0059s) 
20130930, 16:59  #937 
May 2010
Prime hunting commission.
1680_{10} Posts 
bumping yet again with some cofactor PRPs:
((8649*157+46)*2^17090+1)/157 ((9953*157+46)*2^17090+1)/157 ((12728*157+46)*2^17090+1)/157 52376*10^{12870}+1 (12875 digits) Running N1 test using base 3 Special modular reduction using allcomplex FFT length 4K on 52396*10^12870+1 Calling BrillhartLehmerSelfridge with factored part 69.87% 52396*10^12870+1 is prime! (20.8757s+0.0227s) 
20130930, 21:19  #938 
May 2010
Prime hunting commission.
2^{4}×3×5×7 Posts 
kbbGFN:
(14903*876^{876})^4+1 (10328 digits) Primality testing (14903*876^876)^4+1 [N1, BrillhartLehmerSelfridge] Running N1 test using base 5 Generic modular reduction using generic reduction FFT length 3584 on A 34307bit number Calling BrillhartLehmerSelfridge with factored part 63.22% (14903*876^876)^4+1 is prime! (8.4195s+0.0046s) 
20131231, 15:24  #939 
Apr 2010
Over the rainbow
3×11×73 Posts 
appropriatly for today
Code:
31122013*2^56+1 31122013*2^57 + 3 is prime! (verification : a = 3) [25 digits]  Sophie Germain  31122013*2^476+1 31122013*2^692+1 31122013*2^818+1 31122013*2^13178+1 31122013*2^40592+1 Last fiddled with by firejuggler on 20131231 at 15:25 
20140107, 09:28  #940  
May 2007
Kansas; USA
3·19·179 Posts 
Quote:
31122013*2^56 + 1 31122013*2^57 + 3 31122013*2^57  3 are all prime 

20140414, 18:18  #941 
Sep 2010
Scandinavia
1147_{8} Posts 
Code:
Primality testing 1038990*2^1048320+1 [N1, BrillhartLehmerSelfridge] Running N1 test using base 11 Calling BrillhartLehmerSelfridge with factored part 100.00% 1038990*2^1048320+1 is prime! (2165.2179s+0.0009s) Just outside of the top5000, I believe. 
20140526, 23:45  #942  
"W. Byerly"
Aug 2013
1423*2^21790231
94_{10} Posts 
Quote:


20141129, 06:02  #943 
Sep 2013
Perth, Au.
98_{10} Posts 
Compositorial primes
Found some new Compositorial primes:
15250!/15250#1 17258!/17258#+1 How can I figure out the decimal length? 
20141129, 06:19  #944 
Sep 2002
Database er0rr
2·1,699 Posts 
Code:
./pfgw64 d od q'len(15250!/15250#1)' f0 PFGW Version 3.7.7.64BIT.20130722.x86_Dev [GWNUM 27.11] No factoring at all, not even trivial division len(15250!/15250#1): 50623 Code:
./pfgw64 d od q'len(17258!/17258#+1)' f0 PFGW Version 3.7.7.64BIT.20130722.x86_Dev [GWNUM 27.11] No factoring at all, not even trivial division len(17258!/17258#+1): 58207 
20150711, 13:16  #945 
Sep 2010
Scandinavia
3·5·41 Posts 
1224323*2^1048321+1 is prime.

20150726, 21:43  #946 
"Daniel Jackson"
May 2011
14285714285714285714
601 Posts 
Here's some primes that I found (only primes >10^{1000}):
101954445583631786514*36^{1516}1 101954445583631786514*36^{1577}1 101954445583631786513*36^{653}+1 101954445583631786513*36^{861}+1 101954445583631786513*36^{1464}+1 101954445583631786513*36^{4021}+1 101954445583631786513*36^{5571}+1 I've actually found a lot more (2127 in total, including PRPs), but I don't want to spam the forums. Last fiddled with by Stargate38 on 20150726 at 21:47 
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