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Message boards : Cullen/Woodall prime search : What is searched for Cullen & Woodal?

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Jonas Skendelis

Joined: 12 Dec 10
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Message 107648 - Posted: 5 May 2017 | 5:21:10 UTC

New generized cullen/woodal project states that it is searching primes for n·bn±1 for b=(13, 25, 29, 41, 47, 49, 53, 55, 69, 73, 101, 109, 116, 121)
It is interesting, what parameters (n. b) are for "old" Cullen and Woodal projects?
Tnx, -js-

vasyannyasha

Joined: 20 Feb 17
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Message 107649 - Posted: 5 May 2017 | 6:12:00 UTC

Look here for Cullen http://www.primegrid.com/stats_cullen_llr.php
Look here for Woodall http://www.primegrid.com/stats_woodall_llr.php
base of "old" Woodall and Cullen prime searches is 2.
____________
(252^6548-1)^2-2 is prime! Small, but mine.
134137784^32768+1(DC)
107853608^8192+1(DC)
10465966^16384+1(DC)

Michael Goetz
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Message 107655 - Posted: 5 May 2017 | 10:57:16 UTC - in response to Message 107648.

New generized cullen/woodal project states that it is searching primes for n·bn±1 for b=(13, 25, 29, 41, 47, 49, 53, 55, 69, 73, 101, 109, 116, 121)
It is interesting, what parameters (n. b) are for "old" Cullen and Woodal projects?
Tnx, -js-

Cullen and Woodall differ from GCW in that b=2 and we're looking for as many primes as we can find. With GCW, once any prime is found in a base we stop searching that base. With Cullen and Woodall, we'll keep searching for more primes.
____________
My lucky number is 75898524288+1

Jonas Skendelis

Joined: 12 Dec 10
Posts: 18
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Credit: 22,131,912
RAC: 13,065

Message 107657 - Posted: 5 May 2017 | 11:45:33 UTC - in response to Message 107655.

ok, tnx, now it's clear... Just it was interesting, how big is n for Cullen and Woodal for the moment...

Michael Goetz
Volunteer moderator

Joined: 21 Jan 10
Posts: 13311
ID: 53948
Credit: 224,171,078
RAC: 35,028

Message 107660 - Posted: 5 May 2017 | 13:36:33 UTC - in response to Message 107657.

ok, tnx, now it's clear... Just it was interesting, how big is n for Cullen and Woodal for the moment...

Look to the left of this page. See the menu with all the links? Under "Other", click on "Subproject Status". That brings you to a page that shows a summary for each sub project. Click on the "Range statistics" link under Cullen or Woodall to get to a more detailed page. You'll find the information you're looking for on those detailed statistics pages.

EDIT: Actually, you won't. That information should be there, but it's not. It tells you approximately where the leading edge n is, but not the exact number.

Current Cullen leading edge is n=15478540
Current Woodall leading edge is n=16130439
____________
My lucky number is 75898524288+1

JeppeSN

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Message 107675 - Posted: 5 May 2017 | 20:38:47 UTC

Maybe Jonas Skendelis meant to ask: For other b values with 2<b<121 than those mentioned, i.e. {13, 25, 29, 41, 47, 49, 53, 55, 69, 73, 101, 109, 116, 121}, what are the already known n values such that n*b^n ± 1 are "old" primes (but still generalized Cullen/Woodall)? /JeppeSN

vasyannyasha

Joined: 20 Feb 17
Posts: 35
ID: 493939
Credit: 1,731,287
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Message 107740 - Posted: 8 May 2017 | 15:09:48 UTC

Here is list of all bases 3 through 10000:
For Wodall's - http://harvey563.tripod.com/GWlist.txt
Here is list of all bases 3 through 100:
For Cullen's - http://www.loeh.name/guenter/gc/status.html
You can see, that all bases, taken by PG, haven't primes.
____________
(252^6548-1)^2-2 is prime! Small, but mine.
134137784^32768+1(DC)
107853608^8192+1(DC)
10465966^16384+1(DC)

Message boards : Cullen/Woodall prime search : What is searched for Cullen & Woodal?