mersenneforum.org Search Results
 Register FAQ Search Today's Posts Mark Forums Read

 Showing results 1 to 25 of 230 Search took 0.03 seconds. Search: Posts Made By: Jens K Andersen
 Forum: Miscellaneous Math 2014-12-12, 17:22 Replies: 9 Views: 633 Posted By Jens K Andersen You are missing 1, and it's more common to use 29... You are missing 1, and it's more common to use 29 than -1. The usual form is (1,7,11,13,17,19,23,29 + 30*n). In case you don't know, 30 = 2*3*5 (product of the first three primes), and...
 Forum: MattcAnderson 2013-11-01, 17:52 Replies: 119 Views: 28,166 Posted By Jens K Andersen Here is a PARI/GP function to test whether a... Here is a PARI/GP function to test whether a constellation is admissible: admissible(v)=forprime(p=2,#v,if(#Set(v%p)==p,return(0)));1 This function returns the inadmissible primes:...
 Forum: Software 2013-03-19, 02:29 Replies: 4 Views: 747 Posted By Jens K Andersen What are you varying? If pn# is fixed then I have... What are you varying? If pn# is fixed then I have an unpublished program APTreeSieve which can sieve any arithmetic progression up to at least 700000 digits. For k*274579#+-1 it's around 10 times as...
 Forum: Puzzles 2013-03-04, 01:51 Replies: 40 Views: 4,401 Posted By Jens K Andersen That Wikipedia article currently has 9.6 MB... That Wikipedia article currently has 9.6 MB (http://en.wikipedia.org/wiki/Wikipedia:Database_reports/Talk_pages_by_size) of talk page discussions. Let's not compete with that here.
 Forum: Math 2012-08-17, 21:24 Replies: 5 Views: 617 Posted By Jens K Andersen I don't know what you mean here. The 76th prime... I don't know what you mean here. The 76th prime is 383. 26 of the first 76 primes can be written on the form 2^m + 3^n: 2, 3, 5, 7, 11, 13, 17, 19, 29, 31, 41, 43, 59, 67, 73, 83, 89, 97, 113, 131,...
 Forum: MattcAnderson 2012-07-29, 22:02 Replies: 119 Views: 28,166 Posted By Jens K Andersen No. The source is adapted for each run. I... No. The source is adapted for each run. I sometimes mail a version for a specific purpose like breaking a tuplet or Cunningham chain record.
 Forum: MattcAnderson 2012-07-27, 01:57 Replies: 119 Views: 28,166 Posted By Jens K Andersen I have confirmed the 52 smallest 12-tuplets in... I have confirmed the 52 smallest 12-tuplets in http://oeis.org/A213601. It took 10 minutes with my tuplet finder in C on a 2.4 GHz Core 2 Duo.
 Forum: MattcAnderson 2012-07-27, 01:08 Replies: 119 Views: 28,166 Posted By Jens K Andersen There are 20 or 21 examples of each pattern in... There are 20 or 21 examples of each pattern in http://anthony.d.forbes.googlepages.com/ktmin.txt
 Forum: MattcAnderson 2012-07-27, 00:58 Replies: 119 Views: 28,166 Posted By Jens K Andersen In those tables he shows the first appearance to... In those tables he shows the first appearance to be discovered and not the smallest appearance.
 Forum: MattcAnderson 2012-03-16, 15:54 Replies: 119 Views: 28,166 Posted By Jens K Andersen This gives no factor below 2111 for +1610: ... This gives no factor below 2111 for +1610: 2383611079554*1327#+x+{0...3158} I stop here. It was just a small exercise in futility. If we actually tried to find a 447-tuplet then there are better...
 Forum: MattcAnderson 2012-03-16, 05:29 Replies: 119 Views: 28,166 Posted By Jens K Andersen It looks like you made a mistake somewhere. There... It looks like you made a mistake somewhere. There are smaller factors for +6 and +1836: x =...
 Forum: PrimeNet 2011-05-07, 03:20 Replies: 6 Views: 1,531 Posted By Jens K Andersen See... See http://primes.utm.edu/notes/faq/LongestList.html. Considering the time to compute primes versus reading them from a disk or over the Internet, there is not much point in storing trillions of...
 Forum: Chess 2011-03-23, 00:24 Replies: 266 Views: 37,019 Posted By Jens K Andersen Don't expect to compute an exact number. ... Don't expect to compute an exact number. http://en.wikipedia.org/wiki/Chess#Mathematics_and_computers says: The number of legal positions in chess is estimated to be between 1043 and 1047 (a...
 Forum: Math 2011-02-14, 00:09 Replies: 9 Views: 3,329 Posted By Jens K Andersen If a^(N-1)/2=-1 (mod N), then a^(N-1)=1 (mod N),... If a^(N-1)/2=-1 (mod N), then a^(N-1)=1 (mod N), so N is a base-a Fermat prp by Fermat's little theorem (http://primes.utm.edu/glossary/xpage/FermatsLittleTheorem.html). Proth's theorem gives a...
 Forum: Factoring 2011-01-26, 17:17 Replies: 58 Views: 5,043 Posted By Jens K Andersen I mailed this to Donovan Johnson in April 2009: ... I mailed this to Donovan Johnson in April 2009: I found the following probable primes with PrimeForm/GW. They are all listed in http://www.primenumbers.net/prptop/prptop.php Mersenne cofactors...
 Forum: Factoring 2011-01-25, 22:52 Replies: 58 Views: 5,043 Posted By Jens K Andersen Congratulations on beating my record! You can... Congratulations on beating my record! You can also try submitting to http://donovanjohnson.com/mersenne.html
 Forum: Puzzles 2010-12-22, 22:07 Replies: 18 Views: 1,606 Posted By Jens K Andersen Term 10, 22, 3270 were the only primes or prp's... Term 10, 22, 3270 were the only primes or prp's up to 5000.
 Forum: Puzzles 2010-12-22, 15:03 Replies: 18 Views: 1,606 Posted By Jens K Andersen The next is a probable prime in term 3270: ... The next is a probable prime in term 3270: 10^32700+((10^32700-1)/(10^3270-1)-10)/9 is Fermat and Lucas PRP! (534.7103s+0.0111s)
 Forum: Puzzles 2010-12-22, 07:23 Replies: 18 Views: 1,606 Posted By Jens K Andersen The below is based on proven primes. Most of the... The below is based on proven primes. Most of the time was used on proofs. It only lists the last digits from the point where they deviate from the smallest possible number. After the first 5 terms...
 Forum: Math 2010-12-16, 07:12 Replies: 61 Views: 11,916 Posted By Jens K Andersen Getting back to the pointless computations... Getting back to the pointless computations instead of discussing their pointlessness, at http://donovanjohnson.com/mersenne.html I think I found the 5 largest known probable Mersenne semiprimes :...
 Forum: Puzzles 2010-06-22, 03:34 Replies: 10 Views: 938 Posted By Jens K Andersen The earthquake revealing something lost or hidden... The earthquake revealing something lost or hidden in the house was also my first thought. Or maybe his visiting mother in law was crushed to death and his wife would inherit a fortune. :devil: The...
 Forum: Information & Answers 2010-06-16, 01:16 Replies: 45 Views: 5,314 Posted By Jens K Andersen Ah yes, the difference in my example was... Ah yes, the difference in my example was apparently GFN recognition. Omitting division by 2 gives similar time difference: C:\pfgw-work>pfgw -N -b7 base3b.txt PFGW Version 3.3.3.20100325.Win_Stable...
 Forum: Information & Answers 2010-06-16, 00:34 Replies: 45 Views: 5,314 Posted By Jens K Andersen Some PFGW versions can make fast prp tests of... Some PFGW versions can make fast prp tests of cofactors of optimized forms if the cofactor is written in a way recognized by PFGW. Compare these: C:\pfgw-work>pfgw -N -b7 base3.txt PFGW Version...
 Forum: Miscellaneous Math 2010-05-28, 21:18 Replies: 40 Views: 15,571 Posted By Jens K Andersen No, but I would sometimes prefer a change in... No, but I would sometimes prefer a change in attitude towards people who don't live up to your expectations. This is an Internet forum, not an advanced math class. Experience indicates that when you...
 Forum: Miscellaneous Math 2010-05-28, 14:21 Replies: 40 Views: 15,571 Posted By Jens K Andersen I don't know whether it was first posted here or... I don't know whether it was first posted here or moved but I saw it in Miscellaneous Math Threads which doesn't have high math expectations (although you appear to generally have higher expectations...
 Showing results 1 to 25 of 230

All times are UTC. The time now is 14:44.

Sat May 8 14:44:24 UTC 2021 up 30 days, 9:25, 1 user, load averages: 2.07, 2.37, 2.36