20070722, 03:35  #1 
"Jason Goatcher"
Mar 2005
DB3_{16} 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 20070722 at 03:37 
20070724, 11:54  #2  
"Jason Goatcher"
Mar 2005
3·7·167 Posts 
Since it may have been buried by other comments :) :
Quote:


20070806, 19:42  #3 
"Jason Goatcher"
Mar 2005
3·7·167 Posts 
No more bumps after this, I promise.

20070806, 22:34  #4 
Feb 2006
Denmark
230_{10} 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.

20070807, 21:11  #5 
Sep 2004
5·37 Posts 
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 Last fiddled with by Phil MjX on 20070807 at 21:13 
20070808, 02:05  #6  
"Jason Goatcher"
Mar 2005
110110110011_{2} Posts 
Quote:


20070808, 02:07  #7  
"Jason Goatcher"
Mar 2005
3·7·167 Posts 
Quote:
High IQ scores, absolutely I do, but common sense? Not much. 

20070808, 18:29  #8  
Sep 2004
271_{8} Posts 
Quote:
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. 

20070811, 03:37  #9  
"Jason Goatcher"
Mar 2005
3·7·167 Posts 
Quote:
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 20070811 at 03:38 

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