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News

 

Mark Rodenkirch is working on a OpenCL, GPU ready version of his siever dmdsieve v. 1.5.

We will soon have a dedicated page with productivity of each software with double Mersenne numbers.

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The Deep Sieving subproject updated its ranges:

MM28 has been tested up to k = 10,000,000.

None of the primes found divides MM28

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The Deep Sieving subproject updated its ranges:

MM24, MM25 and MM26 have been tested up to k = 12,000,000.

None of the primes found divides the relative double Mersenne number

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The Deep Sieving subproject updated its ranges:

MM18, MM19, MM20, MM21, MM22, MM23 have been tested up to k=200,000,000.

None of the primes found divides the relative Mersenne number

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The Deep Sieving subproject updated its ranges:

MM14 has been tested up to k=200,000,000,000.

None of the primes found divides the relative Mersenne number

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The Deep Sieving subproject updated its ranges:

MM32 has been tested up to k = 2,500,000.

None of the primes found divides MM32

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The Deep Sieving subproject updated its ranges:

MM31 has been tested up to k = 5,000,000.

None of the primes found divides MM31

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The Deep Sieving subproject updated its ranges:

MM30 has been tested up to k = 7,500,000.

None of the primes found divides MM30

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We are back online and kicking!
The Deep Sieving subproject updated its ranges:

MM29 has been tested up to k = 10,000,000.

None of the primes found divides MM29

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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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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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Aketilander posted the first primality test for a factor of MM48!
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Serge Batalov found a titanic prime of more than 909,000 digits while chasing for factors of double Mersenne numbers.
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Serge Batalov donated a new powerful PARI script to presieve large groups of Ks faster.
Thank you Serge!
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Project DoubleMersennes started gathering the lists of prime factors found while testing double Mesennes possible factors.
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LaurV extended the limit of K with status unknown for many double Mersenne numbers.
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Serge Batalov scrolled down MM34 and MM35; Deep sieving project starts its chase for Top 5000 primes.
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48th Mersenne prime number discovered!
On January 25th at 23:30:26 UTC, the largest known prime number, 2^57,885,161-1,
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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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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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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