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Search: Posts Made By: dann corbit
Forum: Information & Answers 2012-08-20, 21:47
Replies: 2
Views: 827
Posted By dann corbit
question about manual checkin of work

When I run new sessions to completion, I get a new line appended to results.txt. So can I simply check in the existing results.txt file or do I need to remove older rows?
Forum: Information & Answers 2012-08-17, 00:50
Replies: 9
Views: 4,157
Posted By dann corbit
For the record: So do I.

For the record:
So do I.
Forum: Information & Answers 2012-08-15, 09:33
Replies: 34
Views: 4,345
Posted By dann corbit
Thanks to all for the excellent explanations and...

Thanks to all for the excellent explanations and new topics to examine. I appreciate the informative, helpful replies and the friendly atmosphere here.
Forum: Information & Answers 2012-08-15, 07:16
Replies: 34
Views: 4,345
Posted By dann corbit
In 2009 there were only 2 known Cullen numbers...

In 2009 there were only 2 known Cullen numbers (which are 2 larger than their pair Woodall numbers) larger than a million digits:
http://primes.utm.edu/top20/page.php?id=6

Have a lot more been...
Forum: Information & Answers 2012-08-15, 07:07
Replies: 34
Views: 4,345
Posted By dann corbit
According to this link (possibly old): ...

According to this link (possibly old):
http://en.wikipedia.org/wiki/Riesel_Sieve
only a single million+ digit prime has been found by that method.

I am very glad you pointed me to that method. ...
Forum: Information & Answers 2012-08-15, 07:03
Replies: 9
Views: 4,157
Posted By dann corbit
Not at all. My only intention was to demonstrate...

Not at all. My only intention was to demonstrate that unexpected benefits often result from purely scientific research. It's a side effect. BTW, I use Mersenne based PRNGs for real work that I do....
Forum: Information & Answers 2012-08-15, 06:59
Replies: 9
Views: 4,157
Posted By dann corbit
As you can probably guess from the names, the...

As you can probably guess from the names, the WELL PRNG is also based on Mersenne Primes:

WELL19937a + new tempering WELL19937a_new.c WELL19937a_new.h
WELL44497a + new tempering...
Forum: Information & Answers 2012-08-15, 01:09
Replies: 34
Views: 4,345
Posted By dann corbit
The fastest way to find a megadigit prime is to...

The fastest way to find a megadigit prime is to search for a Mersenne Prime. It might be possible to use APR-CL on numbers in the million digit range to test for primality, but I suspect that there...
Forum: Information & Answers 2012-08-15, 00:48
Replies: 9
Views: 4,157
Posted By dann corbit
Practical use of Mersenne Primes

Mersenne primes are used in the Mersenne Twister pseudo-random number generators: http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html These generators have several very desirable numerical...
Forum: Forum Feedback 2009-04-14, 19:08
Replies: 1
Views: 1,013
Posted By dann corbit
Suggestion for the GIMPS site

Under "reasons to search for Mersenne primes" they do not list any practical ones. Now, pure research has value in itself, but huge primes also have intrinsic value.

A good example is the...
Forum: Factoring 2008-12-10, 23:16
Replies: 1
Views: 1,247
Posted By dann corbit
Cool The magical ecm.h

It turns out I'm only *mostly* stupid. Maybe I should download and install the referenced ECM project, and voilla:

C:\math\ecm-6.2.1\ecm.h
Forum: Factoring 2008-12-10, 23:07
Replies: 1
Views: 1,247
Posted By dann corbit
ecm.h needed by msieve-1.39

I get this error trying to build a 64 bit version of msieve on Windows 64:
1>..\..\common\smallfact\gmp_ecm.c(35) : fatal error C1083: Cannot open include file: 'ecm.h': No such file or directory
...
Showing results 1 to 12 of 12

 
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