mersenneforum.org possibly abandoned repdigit prime project
 Register FAQ Search Today's Posts Mark Forums Read

 2007-07-22, 03:35 #1 jasong     "Jason Goatcher" Mar 2005 3×7×167 Posts possibly abandoned repdigit prime project If you go here you will discover a project which, in a way, is similar to Riesel Sieve and Seventeen or Bust. Simply put, you have a repeated digit k, that is anything other than 0, and you want to find a series of digits that you can put before or after(one or the other) the repeated digit that will make it so the resultant number is never prime. For instance, if you take the digits 891, no matter how many 7s you put after 891, the resulting integer will NEVER, EVER yield a prime. So, then, the goal would be to prove that 891 is the lowest number for which it is true that it never yields a prime when you have any number of 7s to the right of the number. Simple math tells us that there are 18 separate cases, in terms of the broadest description of the problem. The website was dedicated to solving the problem for all 18 cases, some of which were totally solved. Unfortunately, my email attempt to join the search has gone unanswered, and I'm not sure what to do the next. What's the proper protocol if I want to continue the project? Last fiddled with by jasong on 2007-07-22 at 03:37
2007-07-24, 11:54   #2
jasong

"Jason Goatcher"
Mar 2005

3·7·167 Posts

Since it may have been buried by other comments :) :
Quote:
 Originally Posted by jasong What's the proper protocol if I want to continue the project?

 2007-08-06, 19:42 #3 jasong     "Jason Goatcher" Mar 2005 3×7×167 Posts No more bumps after this, I promise.
 2007-08-06, 22:34 #4 Jens K Andersen     Feb 2006 Denmark 2·5·23 Posts If you cannot get in contact with the organizer Dries De Clercq then I suggest trying the listed participants which I assume are David Kokales, Patrick Keller and our own fetofs.
2007-08-07, 21:11   #5
Phil MjX

Sep 2004

5·37 Posts

Quote:
 Originally Posted by jasong No more bumps after this, I promise.

You'll find many repdigits candidates, with precomputed snfs polys, gnfs and ecm candidates

Regards

Philippe

Last fiddled with by Phil MjX on 2007-08-07 at 21:13

2007-08-08, 02:05   #6
jasong

"Jason Goatcher"
Mar 2005

1101101100112 Posts

Quote:
 Originally Posted by Phil MjX Please have a look at M Kamada's pages : http://homepage2.nifty.com/m_kamada/...orizations.htm You'll find many repdigits candidates, with precomputed snfs polys, gnfs and ecm candidates Regards Philippe
While that's a very interesting page, I was actually interested in finding repdigit primes, not factoring composites. The project I'm interested in is, in some ways, similar to Seventeen or Bust, Riesel Sieve, and the Prime Sierpinski Project.

2007-08-08, 02:07   #7
jasong

"Jason Goatcher"
Mar 2005

3×7×167 Posts

Quote:
 Originally Posted by Jens K Andersen If you cannot get in contact with the organizer Dries De Clercq then I suggest trying the listed participants which I assume are David Kokales, Patrick Keller and our own fetofs.
Thanks for the advice. Notice that I've never claimed to have a lot of common sense, with good reason.

High IQ scores, absolutely I do, but common sense? Not much.

2007-08-08, 18:29   #8
Phil MjX

Sep 2004

5×37 Posts

Quote:
 Originally Posted by jasong While that's a very interesting page, I was actually interested in finding repdigit primes, not factoring composites. The project I'm interested in is, in some ways, similar to Seventeen or Bust, Riesel Sieve, and the Prime Sierpinski Project.
Hi !

At the beginning of each repdigit page, you have the status of the prp found up to date. It may give you a hint for a search start but I agree it isn't a coordinated search.

Regards.

Philippe.

2007-08-11, 03:37   #9
jasong

"Jason Goatcher"
Mar 2005

66638 Posts

Quote:
 Originally Posted by Phil MjX Hi ! At the beginning of each repdigit page, you have the status of the prp found up to date. It may give you a hint for a search start but I agree it isn't a coordinated search. Regards. Philippe.
If we assume it's abandoned, maybe I should start a thread in Mersenne Forum to attempt to complete the project.

Now I just need to figure out which forum to use.

Oh, I just found the small projects forum, I can put it there. :)

Last fiddled with by jasong on 2007-08-11 at 03:38

 Similar Threads Thread Thread Starter Forum Replies Last Post lavalamp Lounge 68 2018-09-09 19:01 IvanP FactorDB 1 2013-10-03 15:41 jasong Open Projects 23 2011-01-22 15:14 David John Hill Jr Miscellaneous Math 91 2008-11-08 18:07 markg PrimeNet 3 2008-05-10 17:30

All times are UTC. The time now is 13:16.

Sat May 21 13:16:56 UTC 2022 up 37 days, 11:18, 0 users, load averages: 1.52, 1.50, 1.47