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Forum: Riesel Prime Data Collecting (k*2^n-1) 2012-11-24, 10:29
Replies: 48
Views: 20,729
Posted By kar_bon
The table shows the first odd k-value of...

The table shows the first odd k-value of Riesel-type numbers a=k*2^n-1 and b=k*2^(n+1)-1 for which a and b both primes (Sophie Germains).

The yellow values are the highest in this table, so for...
Forum: Riesel Prime Data Collecting (k*2^n-1) 2012-11-23, 17:49
Replies: 48
Views: 20,729
Posted By kar_bon
I've extended the page with First odd k with...

I've extended the page with First odd k with Sophie Germain (http://www.rieselprime.de/Related/FirstSG.htm) from n=4000 to n=10000.
Forum: Riesel Prime Data Collecting (k*2^n-1) 2012-09-11, 21:32
Replies: 48
Views: 20,729
Posted By kar_bon
On occasion of the recent finds I've updated my...

On occasion of the recent finds I've updated my pages for Home Prime Base 10 (49) (http://www.rieselprime.de/Others/HomePrime10.htm) and the Euclid-Mullin-Sequence...
Forum: Riesel Prime Data Collecting (k*2^n-1) 2012-06-23, 17:48
Replies: 48
Views: 20,729
Posted By kar_bon
Next Riesel Prime just verifying: ...

Next Riesel Prime just verifying:

252191*2^5497878-1 (http://primes.utm.edu/primes/page.php?id=107886) should be place 21 on Top5000.
Forum: Riesel Prime Data Collecting (k*2^n-1) 2012-02-03, 10:30
Replies: 48
Views: 20,729
Posted By kar_bon
New Riesel Prime found by PrimeGrid...

New Riesel Prime found by PrimeGrid (http://www.primegrid.com/download/trp-162941.pdf):

162941*2^993718-1 (http://primes.utm.edu/primes/page.php?id=104170) found by D.Domanov.

This prime was...
Forum: Riesel Prime Data Collecting (k*2^n-1) 2011-12-26, 09:32
Replies: 48
Views: 20,729
Posted By kar_bon
PrimeGrid...

PrimeGrid (http://www.primegrid.com/forum_thread.php?id=3874) found (by Timothy D. Winslow) the lagest Twin so far: 3756801695685*2^666669±1 (http://primes.utm.edu/primes/page.php?id=103792) on...
Forum: Riesel Prime Data Collecting (k*2^n-1) 2011-11-24, 00:46
Replies: 48
Views: 20,729
Posted By kar_bon
I've included an ASCII-file with Riesel-primes...

I've included an ASCII-file with Riesel-primes for 10000 < k < 100000 and

- all k's: n<=1007 (from G.Barnes)
- k < 15000: n<=20000 (from T.Ritschel)

Thanks both for the data.

Some numbers:...
Forum: Riesel Prime Data Collecting (k*2^n-1) 2011-10-24, 16:27
Replies: 48
Views: 20,729
Posted By kar_bon
I've included a page for the Project "TPS - Twin...

I've included a page for the Project "TPS - Twin Prime Search" (under "Other Projects").

Data included (up to 2010-10-19 so far):

- primes found (with person, date)
- number of candidates...
Forum: Riesel Prime Data Collecting (k*2^n-1) 2011-09-09, 11:23
Replies: 48
Views: 20,729
Posted By kar_bon
New page for RPS Drive #11 inserted.

New page for RPS Drive #11 inserted.
Forum: Riesel Prime Data Collecting (k*2^n-1) 2011-08-03, 19:56
Replies: 48
Views: 20,729
Posted By kar_bon
Updates: - k-values in page 8000<k<10000 are...

Updates:

- k-values in page 8000<k<10000 are sorted
- page for RPS Drive #7 completed (some missing countings still there)
Forum: Riesel Prime Data Collecting (k*2^n-1) 2011-07-17, 11:13
Replies: 48
Views: 20,729
Posted By kar_bon
About 95% of my time I'm participating in the...

About 95% of my time I'm participating in the NPLB project and the ranges are already sieved to best fit.

The last page I've done with PFGW, so no need to sieve fast and deep.
Forum: Riesel Prime Data Collecting (k*2^n-1) 2011-07-15, 22:02
Replies: 48
Views: 20,729
Posted By kar_bon
I've included a new page for the first odd k, for...

I've included a new page for the first odd k, for which k*2^n+1 is prime, n<=10000.

A graph is shown, too.
Forum: Riesel Prime Data Collecting (k*2^n-1) 2011-07-09, 01:24
Replies: 48
Views: 20,729
Posted By kar_bon
I've included a 'new' page with my first version...

I've included a 'new' page with my first version of these pages online in 2007 at RPS to see, how much the data and lookalike changed since then.

There's also a link to the thread in this forum,...
Forum: Riesel Prime Data Collecting (k*2^n-1) 2011-07-08, 09:49
Replies: 48
Views: 20,729
Posted By kar_bon
Status 2nd Quarter 2011

Riesel:
8062 k-values (7+)
164378 primes (1436+)
3462 twins (5+)
10565 Top5000-links (1033+)

Proth:
5000 k-values
149539 primes
2271 twins
Forum: Riesel Prime Data Collecting (k*2^n-1) 2011-06-16, 07:40
Replies: 48
Views: 20,729
Posted By kar_bon
No. I used pfgw for this range of small primes. ...

No. I used pfgw for this range of small primes.
Most of the values are already known in my database (where k<10000), so only the k-values >10000 were done new.
Forum: Riesel Prime Data Collecting (k*2^n-1) 2011-06-14, 23:09
Replies: 48
Views: 20,729
Posted By kar_bon
I've included a new page: First odd k, for...

I've included a new page:

First odd k, for which k*2^n-1 is prime, n<=10000

Maximum k-value so far: k=55999 for n=8867.

A graph presents all values.

I plan to continue this table and add...
Forum: Riesel Prime Data Collecting (k*2^n-1) 2011-06-01, 11:09
Replies: 48
Views: 20,729
Posted By kar_bon
Next Riesel Prime: 353159*2^4331116-1 just...

Next Riesel Prime:

353159*2^4331116-1 just verifying.

Now 57 candidates left.
Forum: Riesel Prime Data Collecting (k*2^n-1) 2011-05-29, 15:30
Replies: 48
Views: 20,729
Posted By kar_bon
The next Riesel Prime: 141941*2^4299438-1 is...

The next Riesel Prime:

141941*2^4299438-1 is still in progress.

So 58 candidates left.
Forum: Riesel Prime Data Collecting (k*2^n-1) 2011-05-24, 19:53
Replies: 48
Views: 20,729
Posted By kar_bon
New page for RPS 2nd Megabit Drive included. ...

New page for RPS 2nd Megabit Drive included.

Factors of Fermats and Generalized Fermats maked for k<=9 and some in 1000<k<100000 on the Proth-pages (thanks W.Keller).
Forum: Riesel Prime Data Collecting (k*2^n-1) 2011-05-13, 23:49
Replies: 48
Views: 20,729
Posted By kar_bon
And here's the next Riesel Prime in sight: ...

And here's the next Riesel Prime in sight:

415267*2^3771929-1 (http://primes.utm.edu/primes/page.php?id=100064) is still in progress (a little bit smaller than the last one).

So 59 candidates...
Forum: Riesel Prime Data Collecting (k*2^n-1) 2011-05-12, 07:23
Replies: 48
Views: 20,729
Posted By kar_bon
A new Riesel-Prime seems to be found yesterday:...

A new Riesel-Prime seems to be found yesterday: 123547*2^3804809-1 (http://primes.utm.edu/primes/page.php?id=100051). The verification is still in progress.

So (if it's a new one) 'only' 60...
Forum: Riesel Prime Data Collecting (k*2^n-1) 2011-04-21, 10:48
Replies: 48
Views: 20,729
Posted By kar_bon
I just noticed, that PrimeGrid found another...

I just noticed, that PrimeGrid found another Riesel-problem prime on 2011-04-05 (announcement here (http://www.primegrid.com/download/trp-65531.pdf)):

65531*2^3629342-1...
Forum: Riesel Prime Data Collecting (k*2^n-1) 2010-10-17, 17:12
Replies: 48
Views: 20,729
Posted By kar_bon
Found doubled prime in C.Caldwell's Top5000...

Found doubled prime in C.Caldwell's Top5000 Database:


155*2^67973+1 (http://primes.utm.edu/primes/page.php?id=62875&deleted=1) (now deleted!) and 155*2^67973+1...
Forum: Riesel Prime Data Collecting (k*2^n-1) 2010-10-06, 09:12
Replies: 48
Views: 20,729
Posted By kar_bon
Status 3rd Quarter 2010

8055 k-values (5+)
162942 primes (~1300+)
3457 twins (1+)
9532 Top5000-links (308+)

Updated also Statistics and Riesel_all / Twins_all download files.
Forum: Riesel Prime Data Collecting (k*2^n-1) 2010-07-28, 00:38
Replies: 48
Views: 20,729
Posted By kar_bon
I've submitted the above sequence to "The On-Line...

I've submitted the above sequence to "The On-Line Encyclopedia of Integer Sequences" and can be found here (http://www2.research.att.com/~njas/sequences/A179658).
Showing results 1 to 25 of 38

 
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