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Message boards :
Cullen/Woodall prime search :
What is searched for Cullen & Woodal?
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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- | |
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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.
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(252^6548-1)^2-2 is prime! Small, but mine.
134137784^32768+1(DC)
107853608^8192+1(DC)
10465966^16384+1(DC)
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 Michael Goetz Volunteer moderator
Project administrator
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Joined: 21 Jan 10
Posts: 14036
ID: 53948
Credit: 475,889,971
RAC: 246,026
                               
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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.
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My lucky number is 75898524288+1 | |
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ok, tnx, now it's clear... Just it was interesting, how big is n for Cullen and Woodal for the moment... | |
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Michael GoetzVolunteer moderator
Project administrator
Send message
Joined: 21 Jan 10
Posts: 14036
ID: 53948
Credit: 475,889,971
RAC: 246,026
|
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
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My lucky number is 75898524288+1 | |
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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 | |
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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.
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(252^6548-1)^2-2 is prime! Small, but mine.
134137784^32768+1(DC)
107853608^8192+1(DC)
10465966^16384+1(DC)
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Message boards :
Cullen/Woodall prime search :
What is searched for Cullen & Woodal? |
