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 2011-01-17, 01:30 #34 Lennart     "Lennart" Jun 2007 46016 Posts 10071*2^482995+1 is not prime. Proth RES64: 5932B5BFFD45353B Time : 364.135 sec. 10071*2^482995-1 is Prime! Lennart
 2011-01-17, 18:58 #35 Oddball     May 2010 499 Posts I've just checked all of the primes found in the rally and their +1 counterparts. No twins were found. edit: The rally thread has now been unsticked. Last fiddled with by Oddball on 2011-01-17 at 19:02
 2011-02-01, 08:46 #36 Oddball     May 2010 499 Posts The n=480K-485K, k<100K range is complete, so here's the breakdown of primes found: n=480K-481K: 6 primes n=481K-482K: 8 primes n=482K-483K: 8 primes n=483K-484K: 1 prime n=484K-485K: 8 primes k=1-20K: 10 primes k=20K-40K: 10 primes k=40K-60K: 1 prime k=60K-80K: 5 primes k=80K-100K: 5 primes It looks like the prime distribution is more uneven over ranges of k than over ranges of n.
 2011-03-27, 09:15 #37 Lennart     "Lennart" Jun 2007 112010 Posts 148323*2^483356-1 is Prime ! 148323*2^483356+1 is composite: RES64: [627C0FF8924559E6] Lennart
2011-03-27, 18:25   #38
Oddball

May 2010

1111100112 Posts

Quote:
 Originally Posted by Lennart 148323*2^483356-1 is Prime ! 148323*2^483356+1 is composite: RES64: [627C0FF8924559E6]
I got a different residue:
148323*2^483356+1 is not prime. RES64: E706A9FB79FE1491

 2011-03-27, 18:45 #39 Mini-Geek Account Deleted     "Tim Sorbera" Aug 2006 San Antonio, TX USA 2×5×7×61 Posts With PFGW 3.4.4: 148323*2^483356+1 is composite: RES64: [627C0FF8924559E6] This matches Lennart's result. Maybe Oddball's was with a different algorithm that produces incompatible residues.
2011-03-27, 18:59   #40
ellipse

Nov 2010

2×3×5 Posts

Quote:
 Originally Posted by Mini-Geek With PFGW 3.4.4: 148323*2^483356+1 is composite: RES64: [627C0FF8924559E6] This matches Lennart's result. Maybe Oddball's was with a different algorithm that produces incompatible residues.
The original results file here: http://noprimeleftbehind.net/tps/res..._tps_12000.txt

matches Oddball's residue, but using PFGW gives the same residue as yours.

 2011-03-27, 19:37 #41 mdettweiler A Sunny Moo     Aug 2007 USA (GMT-5) 3·2,083 Posts Mini-Geek and Lennart: you appear to have used PFGW for your tests. Since it does a PRP test, its residues will be incompatible with those from LLR, which does a Proth (full primality) test. Oddball appears to have used LLR, hence the discrepancy. For base 2, you generally want to stick with LLR for consistency purposes. Last fiddled with by mdettweiler on 2011-03-27 at 19:37
 2011-03-27, 19:43 #42 Lennart     "Lennart" Jun 2007 21408 Posts First was PFGW Here is LLR 148323*2^483356+1 is not prime. Proth RES64: E706A9FB79FE1491 Time : 449.365 sec. Lennart
 2011-04-25, 18:54 #43 Lennart     "Lennart" Jun 2007 25·5·7 Posts 173943*2^480166-1Is Prime 179025*2^480578-1Is Prime 115095*2^480748-1Is Prime 112983*2^480882-1Is Prime 146649*2^480989-1Is Prime 182379*2^481201-1Is Prime 158655*2^481257-1Is Prime 101085*2^483510-1Is Prime 117711*2^483635-1Is Prime 103077*2^483810-1Is Prime 182523*2^483936-1Is Prime I am just now checking the plus side. Lennart
2011-04-25, 19:02   #44
mdettweiler
A Sunny Moo

Aug 2007
USA (GMT-5)

3·2,083 Posts

Quote:
 Originally Posted by Lennart 173943*2^480166-1Is Prime 179025*2^480578-1Is Prime 115095*2^480748-1Is Prime 112983*2^480882-1Is Prime 146649*2^480989-1Is Prime 182379*2^481201-1Is Prime 158655*2^481257-1Is Prime 101085*2^483510-1Is Prime 117711*2^483635-1Is Prime 103077*2^483810-1Is Prime 182523*2^483936-1Is Prime I am just now checking the plus side. Lennart
Note that ever since we upgraded the PRPnet server to version 4.1.4, it has clients check the +1's automatically (and stores the residuals in the server results files, available from http://www.noprimeleftbehind.net/tps/). Of course, you may still want to do a doublecheck, but the initial check is automatically taken care of (generally on the same client machine that found the original -1 prime).

Last fiddled with by mdettweiler on 2011-04-25 at 19:02

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