20070115, 07:41  #1 
Sep 2006
France
24_{10} Posts 
WE MADE IT!!!!!!!!!!!!!!!!!!!!!!
I didn't believe it when I saw something in the output file... but it was true :
2003663613*2^1950001 is prime! 2003663613*2^195000+1 is prime! I hope there's no bug in the program I let you crosscheck it... Eric 
20070115, 08:19  #2  
Sep 2002
Database er0rr
2^{4}×3×83 Posts 
I've checked: Quote:
Quote:


20070115, 08:31  #3 
Jan 2005
Minsk, Belarus
2^{4}×5^{2} Posts 
Congratulations!
A nice pair. :) 
20070115, 08:41  #4 
Mar 2004
Belgium
34D_{16} Posts 
Congratulations!

20070115, 08:45  #5 
"Robert Gerbicz"
Oct 2005
Hungary
1,531 Posts 
Yes, you should have to check this, because for k*2^n1 the LLR do *only* a PRP test, because a true primality test is a little slower. The primality test is a classical p+1 test. ( I think for k*2^n+1 a PRP test is equivalent to a Proth test in LLR so that sholud be OK ).
You've beaten the hungarian Járai Antal and his team's twin prime record at ELTE. Last fiddled with by R. Gerbicz on 20070115 at 09:00 
20070115, 09:04  #6 
Oct 2005
Italy
3×113 Posts 
I hope that twinprimesearch.org will be cited in the papers on this discovery.
Thanks to everybody ! 
20070115, 09:08  #7 
Dec 2006
Anchorage, Alaska
2×3×13 Posts 
I hope the proper channels were used to notify, in order to keep others from reporting the twin prime.
GJ!!!! 
20070115, 09:17  #8 
Oct 2005
Italy
3·113 Posts 
I emailed Chris Caldwell telling this discovery. Please write down the names (name , surname, age and country) of the people who should get credit of this discovery.
Even if twinprimesearch.org should not get any credit, i Hope that you agree that it should be cited in the papers of the discovery. I think something like that: "Today, January 15, 2007 two distributed computing projects, Twin Internet Prime Search and PrimeGrid, have found the largest known twin primes: 2003663613*2^1950001 and 2003663613*2^195000+1 . The numbers have XXXX digits. The discovery was made by: <LIST OF THE PEOPLE WHO GETS CREDITS>". we should send this news to the Guinness World Records. Last fiddled with by pacionet on 20070115 at 09:27 
20070115, 09:38  #9 
"Robert Gerbicz"
Oct 2005
Hungary
1,531 Posts 
The twins have 58711 digits (in base 10).
I've also finished a check by pfgw on my slow computer: Code:
PFGW Version 20050213.Win_Dev (Alpha/IBDWT 'caveat utilitor') Primality testing 2003663613*2^195000+1 [N1 Proth test] Running N1 Proth test using base 11 (2^195000 is 99.985% of N1) 2003663613*2^195000+1 is prime! (477.5060s+0.0083s) Done. PFGW Version 20050213.Win_Dev (Alpha/IBDWT 'caveat utilitor') Primality testing 2003663613*2^1950001 [N+1, BrillhartLehmerSelfridge] Running N+1 test using discriminant 5, base 1+sqrt(5) Calling BrillhartLehmerSelfridge with factored part 99.98% 2003663613*2^1950001 is prime! (3448.9456s+0.0122s) Done. Last fiddled with by R. Gerbicz on 20070115 at 09:40 
20070115, 09:52  #10 
Oct 2005
Italy
3·113 Posts 
My special thanks for this discovery:
 eric_v , of course;  MooooMoo  gribozavr  PrimeGrid  Jean Penne' for LLR  Paul Jobling for NewPGen and ... myself Now, it's time to move to next exponent ! Last fiddled with by pacionet on 20070115 at 09:57 
20070115, 09:54  #11  
May 2004
FRANCE
2×3×97 Posts 
Quote:
Please note that LLR does a deterministic primality test on both k*2^n+1 and k*2^n1 numbers, not a PRP! It actually does a PRP test only if the base is not two. Regards, Jean 

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