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Forum: Data 2021-11-29, 04:54
Replies: 1,005
Views: 123,426
Posted By Zhangrc
B2=90M for wavefront P-1(108M)

[Nov 29 12:46] Setting affinity to run worker on CPU core #2
[Nov 29 12:46] Optimal P-1 factoring of M108390077 using up to 11571MB of memory.
[Nov 29 12:46] Assuming no factors below 2^77 and 2...
Forum: Data 2021-11-27, 01:24
Replies: 1,005
Views: 123,426
Posted By Zhangrc
It should be "exp(avg ln B2)", since the chance...

It should be "exp(avg ln B2)", since the chance of finding a factor in P-1 grows almost logarithmically with B2 (assuming B2=k*B1 where k is a constant).
Forum: Data 2021-11-26, 04:32
Replies: 1,005
Views: 123,426
Posted By Zhangrc
BUG report

BUG report -- P-1 missed a factor!
Win10, V30.8b1, on AMD R7 4800H, 4 cores, 1 worker, 16G(8Gx2) DDR4 RAM, 11G of which allocated to Prime95.

[Nov 26 11:49] P-1 on M111298777 with B1=50000,...
Forum: Data 2021-11-26, 01:29
Replies: 1,005
Views: 123,426
Posted By Zhangrc
However, for people who have sufficient RAM, like...

However, for people who have sufficient RAM, like Ben Delo, I think it's better to use 30.8.
I will continue to use 30.7b8, considering that I only give 9GB of RAM to Prime95.
Forum: Data 2021-11-25, 11:36
Replies: 1,005
Views: 123,426
Posted By Zhangrc
With T-level being 30.598, you can assume no...

With T-level being 30.598, you can assume no factor below 2^102 (30.598/0.301).
Why is the B2 value below inconsistent with the value above?
Also, can Prime95 itself guess the estimated T-level...
Forum: Data 2021-11-24, 14:10
Replies: 1,005
Views: 123,426
Posted By Zhangrc
And, when will Prime95 combine P-1 stage 1 with...

And, when will Prime95 combine P-1 stage 1 with PRP? That's another 0.5% to 1% speed improvement.
And after that, I think it's safe to change the number-of-tests-saved value from 2 to 1.
Forum: Data 2021-11-23, 15:49
Replies: 1,005
Views: 123,426
Posted By Zhangrc
M108330041 has a factor: 104618158844229118808143...

M108330041 has a factor: 104618158844229118808143
M108390157 has a factor: 86145124187394692093897
6 factors found out of 340 trials! :bounce:
hurry on before PRP Cat 1 wavefront reaches 108.3M
Forum: greenskull 2021-11-18, 00:56
Replies: 8
Views: 394
Posted By Zhangrc
Really. However we are now using simplified...

Really. However we are now using simplified Chinese, which reads "千里之行始于足下" (于 is the simplified version of 於).
Forum: Marin's Mersenne-aries 2021-11-18, 00:51
Replies: 743
Views: 113,143
Posted By Zhangrc
I doubt that some people did use the proof...

I doubt that some people did use the proof generation software (GPUowl) but forgot (or didn't know how) to upload them, or they just deleted them because the files took up too much space with almost...
Forum: Data 2021-11-16, 15:03
Replies: 1,005
Views: 123,426
Posted By Zhangrc
@Anton Repko: Thanks very much for your help at...

@Anton Repko: Thanks very much for your help at 108.3M, I've already spotted your factor of M108337699.
Now you can do anything below 108.375M, I'll no longer work on the 108.3M range once the PRP...
Forum: Miscellaneous Math 2021-11-16, 07:51
Replies: 429
Views: 40,112
Posted By Zhangrc
See...

See https://www.mersenne.ca/cudalucas.php?model=801, which shows that TF should be done to 2^81, so only +3 to +4 bit levels.



But he might just be interested in finding a factor, which is not...
Forum: Software 2021-11-10, 05:02
Replies: 144
Sticky: Prime95 30.7
Views: 12,323
Posted By Zhangrc
I calculated in...

I calculated in https://www.mersenne.ca/prob.php?exponent=107181343&factorbits=76&b1=403000&b2=403000 that the stage 1 only probability is 1.15%, so you should suppose that only 20 (59*0.0115/0.0336)...
Forum: Data 2021-11-10, 04:30
Replies: 1,005
Views: 123,426
Posted By Zhangrc
107.2M is also complete (1991 unfactored). ...

107.2M is also complete (1991 unfactored).
Please focus on 108.3M which still has 96 factors to go. (I only TFed to find 3 factors, ETA is 2 years, would anyone like to help?)
Forum: Software 2021-11-04, 04:27
Replies: 10
Views: 737
Posted By Zhangrc
It's not worth it, and now people are suggesting...

It's not worth it, and now people are suggesting to use smaller bounds for P-1 (1 test saved if a factor is found, or B1=400000 B2=1800000) to eliminate exponents as quickly as possible.
Forum: Marin's Mersenne-aries 2021-11-01, 09:40
Replies: 60
Views: 4,106
Posted By Zhangrc
My prediction for 59M milestone: 2021-12-31 60M...

My prediction for 59M milestone: 2021-12-31
60M milestone: 2022-03-02

( I've invited a friend to join GIMPS and he is currently testing M63939553 :cool: )
Forum: Lone Mersenne Hunters 2021-10-29, 09:31
Replies: 18
Views: 13,395
Posted By Zhangrc
Factoring M19491001

I'd like to factor M19491001, just because the way it looks.
I did TF to 2^75 and dozens of ECM curves because I noticed that a prior P-1 has been done. So far, no factor was found.
Should I do P+1...
Forum: Miscellaneous Math 2021-10-27, 08:33
Replies: 429
Views: 40,112
Posted By Zhangrc
At least there's one special thing about 168 that...

At least there's one special thing about 168 that has mathematical significance:
The simple group of order 168, PSL(2,Z/7Z), is the second smallest non-trivial simple group. :bounce:
Forum: Marin's Mersenne-aries 2021-10-23, 02:06
Replies: 743
Views: 113,143
Posted By Zhangrc
Took this: ...

Took this:
CERT=0000000000000000000000000B36D139,1,2,188141881,-1,1469859
Will finish this afternoon.
Forum: Data 2021-10-22, 03:32
Replies: 16
Views: 1,356
Posted By Zhangrc
Why? Please show me the reason. We want to...

Why? Please show me the reason.
We want to clear as much as possible using as little computing power. Running large bounds of P-1 on a NF to 2^78 exponent will a lot of time but has little chance...
Forum: Data 2021-10-22, 00:19
Replies: 16
Views: 1,356
Posted By Zhangrc
Off topic. Would you like to help? Any help is...

Off topic. Would you like to help? Any help is greatly appreciated.
Forum: Data 2021-10-22, 00:04
Replies: 16
Views: 1,356
Posted By Zhangrc
I'll do that after I finish PRP M109769981. My...

I'll do that after I finish PRP M109769981.
My conputing power is too weak to finish 108.3M on time. Anyone want to help?
Forum: Data 2021-10-21, 23:49
Replies: 16
Views: 1,356
Posted By Zhangrc
Yes, but there are only 1700 unverified exponents...

Yes, but there are only 1700 unverified exponents in that range. Even if Ben Delo does two third of the work, the average probability is about 4.4%, so still about 15 to go. That could be done by TF...
Forum: Data 2021-10-21, 07:44
Replies: 16
Views: 1,356
Posted By Zhangrc
Getting <2k unfactored exponents for 108.3M

Currently https://www.mersenne.ca/status/tf/0/0/4/10800 shows that there are 2096 unfactored exponents. However, with the expected 4% probability of finding a factor in P-1, we may still have 2020...
Forum: Software 2021-10-20, 06:47
Replies: 32
Views: 1,483
Posted By Zhangrc
Yes. Try version 20 and before at...

Yes. Try version 20 and before at https://download.mersenne.ca/gimps_archive/archived_executables/p95v20.zip, although it makes no sense to get any assignment.
Forum: mersenne.ca 2021-10-20, 05:16
Replies: 16
Views: 1,024
Posted By Zhangrc
The number 114514 is just popular among Chinese...

The number 114514 is just popular among Chinese teenagers. Maybe because its pronunciation in Chinese is similar to some word in Japanese("better world would come?") I don't fully understand. But the...
Showing results 1 to 25 of 126

 
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