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Old 2005-06-26, 16:28   #1
OmbooHankvald
 
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Hi i'm writing a guide on some DC projects including 15k and I have some things I can't seem to work out:

1) In NewPGen: Do you always use "k.b^n-1 with fixed k"? Never +1? And always use base 2?

2) What should nmin and nmax be? Does it vary depending on which 15k is chosen? Have some nmin-nmax ranges already been sieved? Where can I check that?

3) Will NewPGen be going on sieving forever if I don't stop it? When would it be a good idea to stop it? When the rate is 1 n pr. second? Or just when I get bored?

4) If I find a prime I'll submit it here. But what do I enter in the two first boxes (obviously I enter my prime(s) in the last)? And do I need to post it somewhere on the forum also? Or should I just email someone and then they will help me to set up a prover's code and that stuff?

5) If I have a NewPGen file for my 15k and have just finished LLR'ing it and maybe have/maybe haven't found primes but I wish to continue sieving/testing that 15k, then must I sieve a new NewPGen file? And what nmin-nmax should I use then?

A whole bunch of questions I know and more may be coming since there're many things I am not sure of
Just ask if you do not understand my questions!

Thanks

OH
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Old 2005-06-27, 14:38   #2
Kosmaj
 
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Please have a look at our sticky threads, in particular
(1) Welcome to 15k Search!, for the list of currently active projects and
(2) NOVICE INSTRUCTIONS & EXPERT , for some hints about when to stop sieving.

It's the best to begin with one high-weight 15k multiplier, sieve by yourself and then run LLR.

Happy hunting!
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Old 2005-06-27, 19:23   #3
OmbooHankvald
 
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Hello Kosmaj.

Yes I have read the stickies before asking these questions but I felt that I missed something.

To give you guys a "visual" (or whatever it's called) of what kind of guide I'm doing you can see here.

I haven't had the time to add the bit about NewPGen to the "Navigator" but it can be found here.
It's the part with "taking a shot" I don't like (since complete n00b probably wouldn't have a clue about this and might just type in 4 or 363436286.

But tell me: Does the idea of combining a couple of FAQ's into one guide suck? Should I just forget about it or carry on?
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Old 2005-06-28, 04:14   #4
lsoule
 
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1. I always use "k.b^n-1 with fixed k" for the 15k project.
The weights of the k's that are on the reservation page were computed
with k*b^n-1

2. nmin should usually be whatever it takes to get on the top-5000 list.
Currently that means nmin should be about 190,000. nmax depends on
how many values you want to check. Currently 300,000 seems reasonable
in that if you don't get a prime between 190k and 300k, you should
pick another k.

3. NewPGen will, by default, sieve forever. The program has many options
for stopping criteria that you can use. Basically, you want to stop it
when it takes longer to sieve out a value than it does to LLR it.

5. Yes, you need to NewPGen a new file if you want to extend your
range. If you have a 'good' k, you'll want to sieve a lot of exponents
at once since sieving 2x exponents takes less than 2x the amount
of time.


I would have found something along the lines of your guide useful
when I was first starting out.

-Larry
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Old 2005-07-11, 03:35   #5
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Quote:
But tell me: Does the idea of combining a couple of FAQ's into one guide suck? Should I just forget about it or carry on?
It's a good idea, but it would be more usefull if it had a sticky at the top of the Other Projects menu.
It would be nice to include 15k, by instructing users to download RMA.exe from:
(Installation instructions are also found here)
http://groups.yahoo.com/group/primeform/

Members can find it here in the files section, located on the left hand side menu.
RMA completely automates everything!
It sieves, tests, counts, displays, and even submits primes.
(with auto-submit feature on) If you don't know what to input, that's ok!
Click START, and RMA will input values at random that are large enough for submital. There is no need to tend to the program or input values, it will continue to return primes infinately.
Though it can be used semi-utomatically for 15k'ers.

Last fiddled with by TTn on 2005-07-11 at 03:39
 
Old 2005-09-03, 17:52   #6
OmbooHankvald
 
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I'm reviving my guide on 15k search and I have a question about reserving a 15k:
What does the different stuff in a line such as "15k = 387376275, w = 3.97/6970(155000)L9" mean? Obviously 387376275 is the k, but what are the other things?

Another thing: What does 15k mean? Is it 15 * k or something like that?
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Old 2005-09-03, 17:57   #7
OmbooHankvald
 
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I
A M
D U M B

I just realized it's written at the top of the page
I need sleep...
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Old 2005-09-03, 18:20   #8
OmbooHankvald
 
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However, I've got another question:
How will n00bs i phase 1 know what nmin to choose? I know that nmin has to be of a certain lenght to make sure that the primes will reach Chris Caldwell, but can't you post the current nmin somewhere?

And BTW, is your website still up to date? It seems a little... Outdated... (last update in 2003)

Last fiddled with by OmbooHankvald on 2005-09-03 at 18:24
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Old 2005-09-03, 22:49   #9
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Quote:
However, I've got another question:
How will n00bs i phase 1 know what nmin to choose? I know that nmin has to be of a certain lenght to make sure that the primes will reach Chris Caldwell, but can't you post the current nmin somewhere?

RMA.NET updates this information automatically,(with internet conneciton, on ofcourse). You do have a point if, not running RMA.NET, or no regular internet connection is available. The prime submission page, does list the number of digits nessesary:
http://primes.utm.edu/primes/submit.php
Currently digit size must be larger than 60222.

Remember that k, will increase the digit size a little bit too.
 
Old 2005-09-04, 06:13   #10
OmbooHankvald
 
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Quote:
Originally Posted by TTn
Currently digit size must be larger than 60222.

Remember that k, will increase the digit size a little bit too.
So in that case k=387376275 should have nmin around 60000? (assuming there weren't any continuation point). Or am I just sleepy again?
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Old 2005-09-04, 06:51   #11
OmbooHankvald
 
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My question above was stupid I guess...

Aren't there some kind of program/java-applet somewhere in which you can enter your k and the required prime lenght and it'll give you a nmin? Surely, that must be an asset to 15k!
Are there any java-gurus around who may be able to do such a thing?

Last fiddled with by OmbooHankvald on 2005-09-04 at 06:51
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