News
06-12-2023
New factor found on Doublemersennes!!!
Phil Moore run Woltman's Prime95 software using the ECM option, and discovered that
ECM found a factor in curve #1, stage #2
Sigma=1539737887565536, B1=11000000, B2=1100000000.
M524287 has a factor: 4565880376922810768406683467841114102689
Phil did a probable prime test on the cofactor (157,677 decimal digits) which came back, as expected, as composite:
M524287/known_factors is not prime. RES64: AC1DA9BA4D9F1B8E. We4: 75DE95DD,00000000
Known factors used for PRP test were:
62914441,
5746991873407,
2106734551102073202633922471,
824271579602877114508714150039,
65997004087015989956123720407169,
4565880376922810768406683467841114102689
Cogratulation Phil!!!
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13-12-2013
The Deep Sieving subproject updated its
tables.
Each double Mersennes from MM34 to MM48 has its K presieved. Every K under 2,000,000 has been tested.
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27-10-2013
Aketilander posted the first primality test for a factor of MM48!
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09-09-2013
Serge Batalov found a titanic prime of more than 909,000 digits while chasing for factors of double Mersenne numbers.
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07-09-2013
Serge Batalov donated a new powerful PARI script to presieve large groups of Ks faster.
Thank you Serge!
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06-09-2013
Project DoubleMersennes started gathering the lists of prime factors found while testing double Mesennes possible factors.
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05-09-2013
LaurV extended the limit of K with status unknown for many double Mersenne numbers.
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03-09-2013
Serge Batalov scrolled down MM34 and MM35; Deep sieving project starts its chase for Top 5000 primes.
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05-02-2013
48th Mersenne prime number discovered!On January 25th at 23:30:26 UTC, the largest known prime number,
257,885,161-1,
was discovered on Great Internet Mersenne Prime Search (GIMPS) volunteer Curtis Cooper's computer.
The new prime number, 2 multiplied by itself 57,885,161 times, less one, has 17,425,170 digits.
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13-12-2012
New release of mmff!George Woltman released
mmff v0.27.
- Bug in testing 187-bit factors of MM127 fixed.
- -lm makefile bug fixed
- With Batalov's help, the next set of 32 n values in k*2^n+1 Fermat factor testing is available (N<175)
As always previous savefiles wiln not work with 0.27 unless the -nocheck argument is used.
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25-10-2012
Tony Forbes worked on MM(34) and MM(35) in 2005.
He sieved all k < 500,000 up to 20,000,000,000.
His work has been recorded and is ready to appear on Doublemersennes.org. Thank yoy Tony!
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03-10-2012
A
logo contest to embellish the logo of our project has been launched in the appropriate thread of MersenneForum.
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03-10-2012
Today a new "
News" page has been added to the site
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01-10-2012
A bug in the
number_format() function of PHP has been corrected.
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29-09-2012
Released
mmff version 0.26.
- MM31 is now supported.
- The "missing k" range output bug is probably fixed.
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25-09-2012
mmff_gfn, a software to search for GFN based on mmff kernel is under development.
Thank you
Serge Batalov!
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24-09-2012
Released
mmff version 0.25.
- The problem reported with auto-select GPUSievePrimes is fixed.
- The "exponentiation failure" bug where a tested k value is too small for the bit-level being worked on is fixed.
- Exponentiation failures from testing k values that are too large should be fixed.
- The funny %g outputs are gone.
- Removed parts of mfaktc code.
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24-09-2012
A
new subproject has started.
We are searching for the biggest prime number that will not be a Mersenne number, trying to find a prime factor that divides MM47.
The name of the project is still unknown... Any ideas?
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23-09-2012
Although composite,
MM31 has been added to the list of the exponents searched by the project.
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23-09-2012
A new
Factors found page has been added to the site.
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