20220701, 15:40  #540 
Sep 2010
Weston, Ontario
11101110_{2} Posts 
For individuals wishing to find Leyland PRPs that are not already known, let me state first of all that I can be of no help in the programming aspect of it. Secondly, it is my personal belief that all PRPs with fewer than 150000 decimal digits are already known. They are charted here. If you wish to find a new Leyland PRP, you will need to figure out how to tailor your search to exclude those "small" values. Finally, there are currently 85 Leyland PRPs in that chart with more than 149999 decimal digits, so you will try to avoid them. For example, all Leyland PRPs with at least 300000 decimal digits but fewer than 305000 decimal digits are believed to be known.

20220701, 15:55  #541  
"Mark"
Apr 2003
Between here and the
2×59^{2} Posts 
Quote:
Is anyone coordinating x^y  y^x? I don't think that you are searching terms of that form. 

20220701, 16:37  #542 
"Oliver"
Sep 2017
Porta Westfalica, DE
10100101001_{2} Posts 
Are you running all canidates through OpenPFGW without sieving them first? That will take multiple times longer! I am sure we (as in "the forum") can help you in getting started with the sieving process first. But I concur with others that you should not feel bound by some random request. Imagine someone saying: Please do PRP/LL work for me until you find a new Mersenne prime. Bad idea.
Last fiddled with by kruoli on 20220701 at 17:20 Reason: Grammar. 
20220701, 16:59  #543  
Bamboozled!
"๐บ๐๐ท๐ท๐ญ"
May 2003
Down not across
2·5,827 Posts 
Quote:
Back then I used homebrew GMP code to test for PRPness after a preliminary sieve and a UBASIC implementation of APRCL for proof up to about 1000 digits. 

20220701, 17:23  #544  
Random Account
Aug 2009
Not U. + S.A.
2527_{10} Posts 
Quote:


20220701, 17:42  #545 
"Oliver"
Sep 2017
Porta Westfalica, DE
1,321 Posts 
Keep in mind that what was asked is a totally absurd amount of work either way. And that it is offtopic.

20220701, 18:01  #546 
Mar 2019
2×163 Posts 
All you are doing is feeding the troll and encouraging sweety to keep posting "please run <WORK>" for me. And in this case, <WORK> isn't even related to x^y+y^x, the actual topic of the thread.
Last fiddled with by mathwiz on 20220701 at 18:02 
20220701, 18:18  #547  
"Curtis"
Feb 2005
Riverside, CA
1010111111111_{2} Posts 
Quote:
Sweety Time for your usual warning posting about your pet projects in threads about other projects is cause for a ban. Stop it, for good. 

20220701, 18:57  #548 
Sep 2010
Weston, Ontario
2×7×17 Posts 
There hasn't been much of any coordination since Andrey Kulsha abandoned (in early 2017) his moderation of the project. To be fair, I don't think that by then there was a lot of activity. Kulsha had 1250 entries in his prime database. Since then, 1525 entries have been added... by six people, two people if we ignore more recent events. Those two people were Norbert and myself. Norbert was using (I believe) the oldfashioned system. I was working (strictly in Mathematica) by decimal length. When I thought that there was an overlap, I alerted Norbert to it. This is why he started posting results here as soon as he found something.

20220701, 19:48  #549 
"Oliver"
Sep 2017
Porta Westfalica, DE
1,321 Posts 
If you could dump the work that has been done I can host a website for that.

20220701, 19:53  #550 
Sep 2010
Weston, Ontario
11101110_{2} Posts 

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Distribution of Mersenne primes before and after couples of primes found  emily  Math  35  20221221 16:32 
Mersenne Primes p which are in a set of twin primes is finite?  carpetpool  Miscellaneous Math  4  20220714 02:29 
Leyland Primes: ECPP proofs  Batalov  XYYXF Project  57  20220630 17:24 
On Leyland Primes  davar55  Puzzles  9  20160315 20:55 
possible primes (real primes & poss.prime products)  troels munkner  Miscellaneous Math  4  20060602 08:35 