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2019-05-01, 20:29   #1420
lycorn

Sep 2002
Oeiras, Portugal

2·19·37 Posts

Quote:
 Originally Posted by axn Most likely these are being run using GMP-ECM.
That sounds (very) reasonable. It does not explain why he is not getting any credit, even for the factors found, though.

2019-05-02, 01:55   #1421
retina
Undefined

"The unspeakable one"
Jun 2006
My evil lair

32·647 Posts

Quote:
 Originally Posted by lycorn It does not explain why he is not getting any credit, even for the factors found, though.
Maybe he doesn't care about credit on mersenne.org. I think the factors say enough.

 2019-05-02, 05:41 #1422 Jwb52z     Sep 2002 2·5·7·11 Posts P-1 found a factor in stage #1, B1=695000. UID: Jwb52z/Clay, M91311949 has a factor: 1679230184991897832914127 (P-1, B1=695000) 80.474 bits
2019-05-02, 05:43   #1423
Jwb52z

Sep 2002

2·5·7·11 Posts

Quote:
 Originally Posted by Thecmaster 90901697 F-PM1 2019-04-20 17:20 0.0 Factor: 462195198223850274269081 / (P-1, B1=695000) Where and how can you check bitlevel on a factor?
I don't have the link at this second, but if you google "GIMPS Factor Bit Depth Calculator" there's a page that comes up where you click to activvate a right hand menu through 3 dark black lines at the top right of the screen and you past the factor into that bottom space and click off of it, but don't make the box go away and it will show you the bit number.

2019-05-02, 10:54   #1424
James Heinrich

"James Heinrich"
May 2004
ex-Northern Ontario

53×59 Posts

Quote:
 Originally Posted by Jwb52z I don't have the link at this second, but if you google "GIMPS Factor Bit Depth Calculator" there's a page that comes up where you click to activvate a right hand menu through 3 dark black lines at the top right of the screen and you past the factor into that bottom space and click off of it, but don't make the box go away and it will show you the bit number.
That's literally any page on www.mersenne.ca, the bitsize calculator is at the bottom of the hamburger menu ≡.

2019-05-02, 14:22   #1425
lycorn

Sep 2002
Oeiras, Portugal

101011111102 Posts

Quote:
 Originally Posted by retina Maybe he doesn't care about credit on mersenne.org. I think the factors say enough.
It is perfectly possible, yes. But I would imagine that, independently of the user willingness for credit, the server would compute and display the corresponding amount whenever a completed work unit is received. This situation seems to indicate that, at least, the work done is not being submitted to the server in the same manner most users submit it.
And it is indeed a shame that the NF-ECM work (i.e. number of curves, if any) is not being recorded, for future reference.

2019-05-02, 22:14   #1426
ixfd64
Bemusing Prompter

"Danny"
Dec 2002
California

44078 Posts

Quote:
 Originally Posted by lycorn That sounds (very) reasonable. It does not explain why he is not getting any credit, even for the factors found, though.
I'm guessing this is because the factors are so large that they cause an overflow when the server tries to calculate how much credit to give. However, this wouldn't explain why there is a small amount of credit as opposed to no credit at all.

2019-05-03, 10:34   #1427
retina
Undefined

"The unspeakable one"
Jun 2006
My evil lair

16BF16 Posts

Quote:
 Originally Posted by Jwb52z I don't have the link at this second, but if you google "GIMPS Factor Bit Depth Calculator" there's a page that comes up where you click to activvate a right hand menu through 3 dark black lines at the top right of the screen and you past the factor into that bottom space and click off of it, but don't make the box go away and it will show you the bit number.
Python can also be coaxed to do this for you locally without needing an Internet connection or a browser.
Code:
python -c "x= 10819968927585403636958816179849566933560096066787125831 ;import math;print(math.log(x,2))"
Output:
Code:
182.819741575

2019-05-03, 10:43   #1428
vebis

Oct 2015

6810 Posts

Quote:
 Originally Posted by retina Python can also be coaxed to do this for you locally without needing an Internet connection or a browser. Code: python -c "x= 10819968927585403636958816179849566933560096066787125831 ;import math;print(math.log(x,2))" Output: Code: 182.819741575
or more puristic with bc (scale is for the number of decimal digits after the decimal point)

Code:
$x=10819968927585403636958816179849566933560096066787125831; echo "scale=4; l($x)/l(2)" | bc -l
182.8320

2019-05-03, 10:51   #1429
retina
Undefined

"The unspeakable one"
Jun 2006
My evil lair

32·647 Posts

Quote:
 Originally Posted by vebis or more puristic with bc (scale is for the number of decimal digits after the decimal point) Code: $x=10819968927585403636958816179849566933560096066787125831; echo "scale=4; l($x)/l(2)" | bc -l 182.8320
That is less accurate.
Code:
x=6129982163463555433433388108601236734474956488734408704; echo "scale=4; l($x)/l(2)" | bc -l 182.0122 The answer should be exactly 182.0000 2019-05-03, 11:57 #1430 vebis Oct 2015 4416 Posts Quote:  Originally Posted by retina That is less accurate. Code: x=6129982163463555433433388108601236734474956488734408704; echo "scale=4; l($x)/l(2)" | bc -l 182.0122 The answer should be exactly 182.0000
That's true, should have mentioned the scale is not only applied to the result.

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