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Old 2022-04-04, 14:06   #2102
kruoli
 
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Quote:
Originally Posted by storm5510 View Post
This is for M7363 which does not appear in any database I can find.
There are already some factors of this number noted in FactorDB.
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Old 2022-04-04, 14:39   #2103
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This is a nice one:

M113334241 has a 112.193-bit (34-digit) factor: 5936815441525476391128324308118983 (P-1,B1=551000,B2=21185000)
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Old 2022-04-04, 16:00   #2104
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Quote:
Originally Posted by James Heinrich View Post
7363 is not prime, therefore it's not a Mersenne number.
Of course it's not prime. All the ECM exponents in the GIMPS database with found factors are not prime either. That section should not exist.

Edit: I think you meant to say it is not a natural prime. Without the "2^" and "-1" it has two factors. 37 and 199.

Last fiddled with by storm5510 on 2022-04-04 at 16:12 Reason: Additional
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Old 2022-04-04, 16:43   #2105
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Quote:
Originally Posted by storm5510 View Post
Of course it's not prime. All the ECM exponents in the GIMPS database with found factors are not prime either. That section should not exist.

Edit: I think you meant to say it is not a natural prime. Without the "2^" and "-1" it has two factors. 37 and 199.
7363 itself is not prime: 7363 = 37*199.

It IS still a Mersenne Number which are all 2n-1 for integer n: https://mathworld.wolfram.com/MersenneNumber.html

BUT it is not a Mersenne Number that GIMPS cares about, since only those with prime exponents have a chance to be a Mersenne Prime, that is why it is not in the databases.
https://www.mersenne.org/report_expo...hi=7400&text=1

Last fiddled with by ATH on 2022-04-04 at 16:52
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Old 2022-04-05, 09:03   #2106
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Finally got my first Top 10 P-1 factor!
M239119 has a 157.217-bit (48-digit) factor: 212381331667662033847003656413805352059577410799 (P-1,B1=30000000,B2=10120247026890)
k = 3 × 71 × 5,573 × 79,999 × 830,887 × 1,653,749 × 5,047,213 × 674,304,195,209
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Old 2022-04-05, 13:43   #2107
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Quote:
Originally Posted by kruoli View Post
Finally got my first Top 10 P-1 factor!
Congrats!
Your new factor coincidentally also pushes my best-ever result out of the top-200
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Old 2022-04-05, 17:52   #2108
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Quote:
Originally Posted by kruoli View Post
Finally got my first Top 10 P-1 factor!
M239119 has a 157.217-bit (48-digit) factor: 212381331667662033847003656413805352059577410799 (P-1,B1=30000000,B2=10120247026890)
k = 3 × 71 × 5,573 × 79,999 × 830,887 × 1,653,749 × 5,047,213 × 674,304,195,209
Excellent find!
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Old 2022-04-08, 00:05   #2109
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P-1 auto-assigned by PrimeNet. Prime95 v29.8 B6

M113476799: Factor: 435875148110816983338962773598903 / (P-1, B1=515000, B2=8368750)
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Old 2022-04-08, 02:32   #2110
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Quote:
Originally Posted by storm5510 View Post
Prime95 v29.8 B6
Why so old?
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Old 2022-04-08, 16:44   #2111
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Quote:
Originally Posted by James Heinrich View Post
Why so old?
I am glad you ask this question. On my older systems, 29.x outperforms 30.x. I never run PRP's or certification work. If I don't use it, then I don't need the capability. I sometimes use a 6.x version of gpuOwl for P-1's, but it is not self-tending like Prime95 is. It is one less thing I have to keep up with.
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Old 2022-04-08, 17:15   #2112
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Quote:
Originally Posted by storm5510 View Post
On my older systems, 29.x outperforms 30.x
I can't comment to other worktypes, but this is absolutely untrue for P-1. v30.8 has made absolutely huge gains in P-1 performance. Do not judge it by how fast it runs, but by the bounds and probability it can achieve. Please don't do P-1 badly, you'll miss factors unnecessarily and (if done badly enough) people may need to re-do your work, which is the definition of inefficient.
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