[QUOTE=storm5510;187226]3,321,929,617. Is everyone here pulling these out of the air? How are you determining these are prime in the basic sense?[/QUOTE]There are actually 2 websites that are available to see what is going on. The first is all in english: [url]http://home.earthlink.net/~elevensmooth/Billion.html[/url]
The second is the main site for Operation Billion Digit (some Italian, some English) : [url]http://www.moregimps.it/billion/index.php[/url]

All the exponents were already screened to for primality (of the p in 2^p-1). Luigi (_ET) actually made a neat little program to list primes starting at a given number.

Lavalamp is cleaning up the exponents that are at lower bit levels. All exponents that remain in the range are now at 2^75 or higher.

Go to the website, find an expo that is not factored and not claimed. Then claim it and test. Currently one needs to use Factor5 or some program other than Prime95 to do the Trial Factoring.

Attached is a fancy picture: [attach]4023[/attach]

The vertical scale in the image is bits? The horizontal scale is exponent size in millions?

I downloaded Factor5, Windows version. I'm going to try this on the Atom laptop. I let it complete is work with P95 and didn't let it take any more. I need something to experiment with.

:smile:

I have a problem understanding the table in the first link despite studying it for a while.

[QUOTE=storm5510;187238]The vertical scale in the image is bits? The horizontal scale is exponent size in millions?

I downloaded Factor5, Windows version. I'm going to try this on the Atom laptop. I let it complete is work with P95 and didn't let it take any more. I need something to experiment with.

:smile:

I have a problem understanding the table in the first link despite studying it for a while.[/QUOTE]I believe that in that image, the horizontal scale is just the number of the candidate, so 1 is 3,321,928,097, 2 is 3,321,928,109 ... 268 is 3,321,933,971.

I also made a dynamically generated graph that's a little bit interactive, though it does not include factored candidates:
[url]http://2721.hddkillers.com/graph/[/url]

Hover over any columns to see information, click one to leave it permanently selected, to deselect click it again, or click on any other column to select that one instead.

[QUOTE=storm5510;187238]The vertical scale in the image is bits?[/quote]
Yes, it is bit level that the exponent has been worked up to.
[QUOTE=lavalamp;187246]I believe that in that image, the horizontal scale is just the number of the candidate, so 1 is 3,321,928,097, 2 is 3,321,928,109 ... 268 is 3,321,933,971.[/QUOTE]Correct, I use this table to make my chart:
[URL="http://www.moregimps.it/billion/expo_t.php"]http://www.moregimps.it/billion/expo_t.php[/URL]
It is so much cleaner to have the small numbers on the axis, rather than smashing all the exponents onto it.

[quote=Uncwilly;187274] Correct, I use this table to make my chart:
[URL]http://www.moregimps.it/billion/expo_t.php[/URL]
It is so much cleaner to have the small numbers on the axis, rather than smashing all the exponents onto it.[/quote]

That's an easy-to-read page. Thanks.

3321933971 is the highest exponent on the list. Why stop there?

I don't see many openings on the list.

I guess you're not looking hard enough then because there are 97 idle exponents. :wink:

They're listed on here:
[url]http://www.moregimps.it/billion/expo_i.php[/url]

I also made this some time ago, but I think the bar graph is clearer:
[url]http://2721.hddkillers.com/billion/live/[/url]

Where would you have stopped? There are 268 candidates in total, most have been factored but there are still 108 to be getting on with.

[quote=lavalamp;187288]I guess you're not looking hard enough then because there are 97 idle exponents. :wink:

They're listed on here:
[URL]http://www.moregimps.it/billion/expo_i.php[/URL]

I also made this some time ago, but I think the bar graph is clearer:
[URL]http://2721.hddkillers.com/billion/live/[/URL]

Where would you have stopped? There are 268 candidates in total, most have been factored but there are still 108 to be getting on with.[/quote]

The first link shows exponents factored to mostly 2[sup]75[/sup] and a few higher. Is there a stop point somewhere?

As for Factor5, how does one stop it, so it can be resumed later? The homepage is sort of sketchy on that part. Cygwin?

Well I don't know about all versions, but factor5 on Windows will output/update a file called status.txt every so often that you can resume from with the command:
factor5 --resume

If you try to start a new trial factoring search while there is a status.txt file in the same folder as the exe, you will get a warning.

It will not delete this file when it has finished, so before you start another search you'll either have to get rid of it manually, or automate the process by some means, for example I use a batch file to run commands sequentially.

To stop it, you can hit ctrl + c, or just close the DOS box it's running in.

As far as stop points, you can stop anywhere you like, though there are some goals. Read the section on project progress just before the table here:
[url]http://home.earthlink.net/~elevensmooth/Billion.html[/url]

The current level is actually 11.04 now as that page hasn't been updated yet. (I also [url=http://2721.hddkillers.com/compare/live/]have a page[/url] for comparing the stats of the two official OBD project pages.)

Be aware that for every bit deeper you go, it will take twice as long as the previous level. If you want a rough eta, try timing how long it takes your machine to run an exponent from 60 to 61 bits (not very long at all), then multiplying by 2^15 will tell you about how long it will take to run an expo from 75 to 76 bits.

I tested it last night running in full-screen mode. Not very practical if one needs to do something else, but it was nice to see the prompts again and text on a black background. I remember seeing the "status" text file after I was done. You did a good job on your web pages...

:smile:

3321928171 to 2[sup]78[/sup].

May take a while... :smile:

[QUOTE=storm5510;187460]3321928171 to 2[sup]78[/sup].

May take a while... :smile:[/QUOTE]

Welcome aboard, and good luck! :smile:

Luigi