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Old 2021-08-09, 03:13   #1915
Happy5214
 
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Quote:
Originally Posted by Viliam Furik View Post
It depends on the allocated RAM, and other things, so allowing ~2.5 GB of RAM per worker probably makes the difference.

Meanwhile...
Oh, you generated your B2s yourself. I let Prime95 generate them. So that's probably the main difference.

You can simply use this tool on mersenne.ca here. You can set your exponent range and B1, and it will generate worktodo lines for you. You only need to delete those which already had a bigger B1 done. Or use a script for them...
No, I used https://github.com/keisentraut/prime95-optimal-worktodo, which leaves B2 blank (letting mprime determine it). However, it also adjusts the TF field in the worktodo based on the ECM level, so I think I was getting lower B2's since there was more ECM work done (and thus a higher implicit TF level). My max RAM allocation for that instance is 32 GB, and it never got close to that while I was doing that range.
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Old 2021-08-13, 19:50   #1916
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M5210099 has a factor: 2944892728119316210127 (P-1, B1=2500000, B2=207500000) (71.319 bits)

It's puny, I know, but I'm fond of it because it's my first non-ECM stage 2 Mersenne factor. My previous P-1 and P+1 factors were both found in stage 1.

Last fiddled with by Happy5214 on 2021-08-13 at 19:51 Reason: Adding size
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Old 2021-08-15, 14:25   #1917
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M23243107 has three factors in the TF71 range. It's kind of a curiosity.
I happened to find 2 factors in one TF range several times, but 3 for the first time!
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Old 2021-08-15, 15:07   #1918
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Quote:
Originally Posted by Miszka View Post
M23243107 has three factors in the TF71 range. It's kind of a curiosity.
I happened to find 2 factors in one TF range several times, but 3 for the first time!
Not so long ago I had a brief discussion with user tuckerkao about the possibility of this happening... Nice luck!
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Old 2021-08-15, 15:12   #1919
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Quote:
Originally Posted by Miszka View Post
M23243107 has three factors in the TF71 range. It's kind of a curiosity.
But not as rare as you might think. There are >2500 such examples in GIMPS range (but only 6 new examples have been found so far in 2021).
There are (so far) only 7 examples where there are 4 known factors in the same bitlevel:
33218089, 128757283, 143570279, 234616103, 563950589, 578590853, 946287211
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Old 2021-08-15, 16:06   #1920
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Quote:
Originally Posted by James Heinrich View Post
But not as rare as you might think. There are >2500 such examples in GIMPS range (but only 6 new examples have been found so far in 2021).
There are (so far) only 7 examples where there are 4 known factors in the same bitlevel:
33218089, 128757283, 143570279, 234616103, 563950589, 578590853, 946287211
These 7 examples have a fairly low bitlevel and it will be rather very difficult to find similar ones with a bitlevel above 70-some
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Old 2021-08-16, 23:55   #1921
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P-1 found a factor in stage #2, B1=760000, B2=20835000.
UID: Jwb52z/Clay, M105530011 has a factor: 700781945616999543935075224151 (P-1, B1=760000, B2=20835000)

99.145 bits.
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Old 2021-08-20, 00:43   #1922
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Not mine, but a pretty triple factor:

M105587893 has a 236.753-bit (72-digit) composite (P23+P24+P26) factor: 186125867355522179214500290117704070927566484401081129960541990698683479 (P-1,B1=823000)
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Old 2021-08-20, 01:25   #1923
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Quote:
Originally Posted by James Heinrich View Post
Not mine, but a pretty triple factor:

M105587893 has a 236.753-bit (72-digit) composite (P23+P24+P26) factor: 186125867355522179214500290117704070927566484401081129960541990698683479 (P-1,B1=823000)
That's pretty sublime.
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Old 2021-08-20, 07:05   #1924
LaurV
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Nice! That is a beauty! I didn't found a triple yet.
Congrats to the founder! (Kriesel)
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Old 2021-08-20, 09:10   #1925
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The smaller with 76.191 bits is close to the 76 bit range for such exponents
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