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2015-06-13, 08:03
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#353 |
May 2007
Kansas; USA
101·103 Posts |
19401*2^3086450-1 is prime!
This also knocks out the same k for base 4. Riesel base 2 even-n is down to 2 k's remaining. My largest prime ever! 
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2015-06-13, 08:07
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#354 | |
Jun 2009
22×32×19 Posts |
Quote:
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2015-06-13, 08:33
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#355 | |
May 2009
Russia, Moscow
259310 Posts |
Quote:
Nice one! 
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2015-06-13, 12:42
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#356 | |
May 2008
Wilmington, DE
22·23·31 Posts |
Quote:
Last fiddled with by MyDogBuster on 2015-06-13 at 12:43 |
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2015-06-13, 19:33
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#357 | |
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Quasi Admin Thing
May 2005
3C616 Posts |
Quote:
  Congratulation on a nice find, now there remains exactly 170 k's for SR 2, 4, 8, 16, 32, 64, 128, 256, 512 and 1024 and only 4 more Riesel k primes then a nice round 100 Riesel (base 2 or power of 2) k's remain b<=1024 
Last fiddled with by KEP on 2015-06-13 at 19:34 |
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2015-06-15, 20:01
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#358 | |
May 2004
FRANCE
11048 Posts |
Nice success, Gary!
Quote:
Here is my present status for Sierpinski even n's : k = 23451 is tested up to n = 3,706,628 base two (1,116,053 decimal digits), no prime, continuing, perhaps still for a long time... but, as you saw, we may be rewarded for our patience! Best Regards, Jean P.S. The file is now sieved up to 880 T |
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2015-07-03, 20:19
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#359 | |
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A Sunny Moo
Aug 2007
USA (GMT-5)
3×2,083 Posts |
Quote:
Last fiddled with by mdettweiler on 2015-07-03 at 20:19 |
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2015-08-03, 06:00
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#360 |
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May 2004
FRANCE
22×5×29 Posts |
A Liskovets-Gallot theorem proven!
02/08/2015,
The Liskovets-Gallot conjecture for Proth numbers and even exponents becomes a theorem! I found : Starting Proth prime test of 23451*2^3739388+1 (1125673 decimal digits) Using all-complex AMD K10 FFT length 320K, Pass1=256, Pass2=1280, a = 5 23451*2^3739388+1 is prime! (1125673 decimal digits) Time : 15201.590 sec. LLR Program - Version 3.8.16, using Gwnum Library Version 28.7 CPU Information: AMD Phenom(tm) II X4 965 Processor CPU speed: 3411.23 MHz CPU features: RDTSC, CMOV, PREFETCH, MMX, SSE, SSE2 L1 cache size: 64 KB L2 cache size: 512 KB 03/08/2015, I verified (with a 32bit machine): Starting Proth prime test of 23451*2^3739388+1 Using all-complex AMD K8 FFT length 320K, Pass1=256, Pass2=1280, a = 5 23451*2^3739388+1 is prime! (1125673 decimal digits) Time : 63583.482 sec. CPU Information: AMD Sempron(tm) Processor 3000+ CPU speed: 1004.70 MHz CPU features: RDTSC, CMOV, PREFETCH, MMX, SSE, SSE2 L1 cache size: 64 KB L2 cache size: 128 KB This is also my first megaprime, and a nice present for a week after my 80th birthday! Best Regards, Jean |
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2015-08-03, 07:07
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#361 |
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May 2009
Russia, Moscow
50418 Posts |
Very nice find, congratulations!
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2015-08-03, 08:07
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#362 |
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May 2008
Wilmington, DE
285210 Posts |
WOW. One of those even-odd thingys is solved. Nice Jean Happy-B'day
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2015-08-03, 08:31
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#363 |
Sep 2002
Database er0rr
375510 Posts |
Jean, congrats on finding your first mega-prime
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