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Old 2011-01-17, 01:30   #34
Lennart
 
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10071*2^482995+1 is not prime. Proth RES64: 5932B5BFFD45353B Time : 364.135 sec.



10071*2^482995-1 is Prime!

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Old 2011-01-17, 18:58   #35
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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
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Old 2011-02-01, 08:46   #36
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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.
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Old 2011-03-27, 09:15   #37
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148323*2^483356-1 is Prime !
148323*2^483356+1 is composite: RES64: [627C0FF8924559E6]


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Old 2011-03-27, 18:25   #38
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Quote:
Originally Posted by Lennart View Post
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
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Old 2011-03-27, 18:45   #39
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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.
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Old 2011-03-27, 18:59   #40
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Quote:
Originally Posted by Mini-Geek View Post
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.
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Old 2011-03-27, 19:37   #41
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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
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Old 2011-03-27, 19:43   #42
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First was PFGW

Here is LLR
148323*2^483356+1 is not prime. Proth RES64: E706A9FB79FE1491 Time : 449.365 sec.

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Old 2011-04-25, 18:54   #43
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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.


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Old 2011-04-25, 19:02   #44
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Quote:
Originally Posted by Lennart View Post
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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