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-   -   121*2^n-1 (https://www.mersenneforum.org/showthread.php?t=2516)

justinsane 2004-05-24 20:43

121*2^n-1
 
Similar to the 321 search, I am running a 12121 search. If anyone is interested in taking a range, check out what is available at [url]http://12121.vocabulate.com[/url]

Thomas11 2004-06-02 17:12

Congrats on your project's latest prime:

121*2^541621-1 :w00t:

That's really amazing!

Happy hunting to you and your coworkers ...

-- Thomas

justinsane 2004-06-02 20:20

thanks!

justinsane 2004-06-03 19:14

[QUOTE=Thomas11]Congrats on your project's latest prime:

121*2^541621-1 :w00t:

That's really amazing!

Happy hunting to you and your coworkers ...

-- Thomas[/QUOTE]


Just found another, 121*2^494317-1
Not as big as the last one, but 4 top primes in 5 days! It's lookin good :showoff:

paulunderwood 2004-07-14 04:51

justinsane wrote:

Hey,

I'm sure you know about my 12121 search, which is essentially a spin off of this 321 search. Similarly, I have my work divided into blocks with a reservation system. I've recently written a few php scripts to automate this reservation system. All I have to do is drop sieve files into a folder and the site handles the rest (displaying which ranges are available, how many n in each range, which are reserved, which are complete, etc) It also handles all submissions and verifies whether all numbers were tested and parses those ugly lresults.txt files and grabs only the pertinent information and stores it on the server. Anyhow, it seems like it would probably help you guys out a lot (imagine...no more editing that forum post) If you want, I could send you the bundle, it would only take a few minor adjustments to make it fit for what youre doing.

See it in action at:
[url]http://12121.vocabulate.com[/url]

paulunderwood 2004-07-14 05:00

A 321 server doing a lot of the tasks I do would be a good thing.

I have been offered server software before and php working on flat files ( or MySQL ) with direct links to a website would be ideal for me as I would hope to set it up here on linux ( eventually ). (L.A.M.P.!)

In the meantime, it is not really a lot of work for me to continue updating this message board; We only have a few particpants.

Good luck with 12121.

paulunderwood 2004-08-14 13:13

[URL=http://primes.utm.edu/primes/page.php?id=71287]http://primes.utm.edu/primes/page.php?id=71287[/URL] is a big prime.

Congratulations :banana:

justinsane 2004-08-15 05:39

I was going to post this monster find on here :showoff: , but you beat me to it! Credit to Michael Haas (NiceMedTexMD) for the find. Hopefully this find will bring in some testers :help:

paulunderwood 2004-11-07 17:12

Congratulations to 12121search for [URL=http://primes.utm.edu/primes/page.php?id=72307]their latest prime[/URL] , putting them in [URL=http://primes.utm.edu/bios/top20.php?type=project&by=ScoreRank]11th place for prime-searching teams[/URL] :cat:

justinsane 2004-11-08 04:12

Wow, you are quick to catch on to these things! :smile:

May this message be a call to volunteers :help: to come join the 12121 search. We seem to have a high density of primes for k=121 (9 qualifying at just over one million searched)

We have also recently implemented a scoring system to "reward" individuals for work done, as well as completing up to and beyond n=1 million, and to respond to requests for smaller more "completable" ranges. There is now a broader array of range sizes, from 25 to 200.

So please join us if you have any cycles to spare. You won't be disappointed!

paulunderwood 2004-11-08 19:20

It's very close: 121 Search is now 12th place -- 15k Search has just overtaken you. Good luck with your future work and with recruiting extra help. :wink:

justinsane 2005-07-19 04:25

Just found a nice big one, but it is in the process of being verified.

121*2^1526097-1 459,404 digits long :showoff:

Still, we could use some help..... :help:

paulunderwood 2005-07-19 10:46

Congratulations :w00t:

Although it is over 1.5M bits long, it didn't quite make the top20 primes. It currently puts your 12121search team above our 321search team [URL=http://primes.utm.edu/bios/top20.php?type=project&by=ScoreRank]on points[/URL]

Good luck with hunting your next big prime.

OmbooHankvald 2005-07-20 10:57

Hi Justinsane congrats on your latest prime!
I have some questions to ask:

1) On your [URL=http://12121.vocabulate.com/]project site[/URL] you say (line 4): "The short term goal of this project is to search for n up to 1,000,000", but when I look in the reservation thing it looks to me as you have already completed n to 1,000,000 (but then again, I'm not a matematician :confused: )

2) What made you choose 121 as k? (just curious)

3) The 12121 and 2721 have a brilliant way of reserving numbers! :bow: ) but wouldn't it be possible for some (evil :furious: ) person to just submit a fake lresults.txt and destroy the whole thing?

Thats it, thanks!

OH

paulunderwood 2005-09-06 20:14

A big semi-mega digit congratulations to 12121search for the prime [URL=http://primes.utm.edu/primes/page.php?id=75527]121*2^1695499-1[/URL] :banana:

It also catapults the team past "15k" on [URL=http://primes.utm.edu/bios/top20.php?type=project&by=ScoreRank]UTM points[/URL] :shock:

justinsane 2005-09-06 21:39

[QUOTE=OmbooHankvald]Hi Justinsane congrats on your latest prime!
I have some questions to ask:

1) On your [URL=http://12121.vocabulate.com/]project site[/URL] you say (line 4): "The short term goal of this project is to search for n up to 1,000,000", but when I look in the reservation thing it looks to me as you have already completed n to 1,000,000 (but then again, I'm not a matematician :confused: )


This is a very short term goal. Once completed, the members at the time decided that they would like to press on to 2,000,000. I have been been a big slow in updating its "goals"


2) What made you choose 121 as k? (just curious)

Honestly, there is not a very good reason. It is a low palindromic perfect square. I thought it might be interesting. Turns out, it is


3) The 12121 and 2721 have a brilliant way of reserving numbers! :bow: ) but wouldn't it be possible for some (evil :furious: ) person to just submit a fake lresults.txt and destroy the whole thing?


You are absolutely correct. However there is a lot more to the reservation system than meets the eye. For example, any webmaster searching any K could feed it a sieve file of any size, and it will automatically be parsed into chunks of any given size, sorted into the reservation system and made available to the public with a click of a button. It is pretty nice when I am limited in my time availability for making new work available. I have offered this to a few other groups running similar searches, but was met with little or no desire to use this approach. And to answer your question, there is a multifold response:

1. There is absolutely nothing to gain by doing this, except for maybe a few laughs.
2. It would take a reasonable amount of time to generate a faken lresults.txt file that looks real enough to even be accepted by this parser. (Doable yes, but worth it?)
3. All submitted results are stored on two different servers and are all subject to double checking and/or verification if (and sometimes if not) flagged as a possible fake.


Thats it, thanks!


You're welcome, and thank you for your interest!
-Justin

OH[/QUOTE]

Answers are all within your quote. I supose I could have made that more readable
-J

grandpascorpion 2005-09-07 03:28

Great work!

Is there any reason why you picked 121? Just curious.

justinsane 2005-09-07 04:13

[QUOTE=grandpascorpion]Great work!

Is there any reason why you picked 121? Just curious.[/QUOTE]

Honestly, there is not a very good reason. It is a low palindromic perfect square. I thought it might be interesting. Turns out, it is


Metro NYC? Where from? I grew up on Staten Island.

grandpascorpion 2005-09-07 23:56

I live in Jersey City now but I'm moving to Queens next month. (Originally, I'm from Rhode Island).

axn 2006-01-20 11:09

[URL="http://primes.utm.edu/primes/page.php?id=76810"]A big one[/URL]. Still undergoing verification.

paulunderwood 2006-01-20 11:21

Congrats for a big "12121" prime. Keep up the good work! Good luck with your next find.

justinsane 2006-01-21 06:11

[QUOTE=paulunderwood]Congrats for a big "12121" prime. Keep up the good work! Good luck with your next find.[/QUOTE]

Thanks, if they keep coming at the rate that they have been.....we might be on to something here!

paulunderwood 2006-01-28 12:27

It looks like it :wink:

Congrats for [URL="http://primes.utm.edu/primes/page.php?id=76880"]another[/URL] this time with 612,280 digits :banana:

justinsane 2006-01-28 18:55

[QUOTE=paulunderwood]It looks like it :wink:

Congrats for [URL="http://primes.utm.edu/primes/page.php?id=76880"]another[/URL] this time with 612,280 digits :banana:[/QUOTE]

Thanks!

Two huge ones in a week......heres to continued success :showoff:

As always, we could still use some :help:


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