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 Prime95 2021-04-23 02:05

[QUOTE=tha;576508][CODE]
[Comm thread Apr 22 18:59] Composite factor 17810607008131132507712387230764284167013708502268550663 = 72324517147464481 * 142671321621631468162223 * 1726062406753801
[Comm thread Apr 22 18:59] Done communicating with server.
[/CODE]

So, mprime 30.5 build 1 found a new factor for an exponent of which three factors were already found before. In the composite factor found two of those three factors were included, the new one of course as well. In the output one previous factor is mentioned correctly, the line that should mention the second previous factor is cut short somehow.[/QUOTE]

Fixed in next build. Thanks.

 Prime95 2021-04-23 02:44

[QUOTE=kriesel;576487]Build 2 calls all the build 1 P+1 save files bad. Perhaps resulting from a mismatch of nth_run parameter.
[/QUOTE]

Yes, the save file contains the nth_run info and it must match the worktodo.txt nth_run parameter.

I've added a message when a save file is rejected due to mismatched nth_run.

I've also added the starting fraction: 2/7, 6/5, whatever to the P+1 start message.

 ATH 2021-04-23 04:22

2nd P+1 factor found by "Dylan Delgado": [M]1600967[/M] 20960634373165261374400215271 B1=2000000 B2=146000000
29 digits ~94.1 bits

It was the 496th reported curve.

Could it be a bug that a P-1 run was registered as a P+1 ?
The factors of P-1 fits within B1 and B2, but not P+1 factors:

P+1 = 2^3 x 11 x 13 x 16047334103 x 1141761785856421

P-1 = 2 x 3^4 x 5 x 219889 x 864733 x 1600967 x 85006373

 ATH 2021-04-23 04:55

Hmm is this a feature of the new P+1 that it is running P-1 at the same time?

I did a P+1 test on a known factor that was found with P-1: [M]173683[/M]

P+1 found a factor in stage #2, B1=200000, B2=200000000.
M173683 has a factor: 973878325823253786426041 (P+1, B1=200000, B2=200000000)

Again it is the P-1 factors that fits B1 and B2.

P+1 = 2 x 3 x 3356964889 x 48351132547063

P-1 = 2^3 x 5 x 11 x 59 x 409 x 3989 x 173683 x 132390053

 Prime95 2021-04-23 05:22

[QUOTE=ATH;576579]Hmm is this a feature of the new P+1 that it is running P-1 at the same time?[/QUOTE]

Yes, kind of. Remember that P+1 only find 50% of factors where factor+1 is B1/B2 smooth? That's because half the time it gets a hit if factor-1 is B1/B2 smooth.

It does show that relatively deep P-1 should be run (because it is faster and gets log2(2*p) free bits of smoothness) before doing a P+1 run.

 Prime95 2021-04-23 05:40

[QUOTE=gLauss;576509]
Why did it take 6 minutes to initiliaze after calculating stage 1 GCD? Something strange must be going on here. might be a bug...[/QUOTE]

I've reproduced the problem, I'll figure it out and find a fix.

 ATH 2021-04-23 08:27

[QUOTE=Prime95;576581]Yes, kind of. Remember that P+1 only find 50% of factors where factor+1 is B1/B2 smooth? That's because half the time it gets a hit if factor-1 is B1/B2 smooth.

It does show that relatively deep P-1 should be run (because it is faster and gets log2(2*p) free bits of smoothness) before doing a P+1 run.[/QUOTE]

Very nice, so do we call this the 2nd P+1 factor or a missed late found P-1 factor: [M]1600967[/M]

Does it save time doing both or is the cost the combined cost of P+1 and the faster P-1 ?`

 nordi 2021-04-23 11:15

Another two factors found with P+1. One is P-1 smooth:

[URL="https://www.mersenne.org/report_exponent/?exp_lo=1601783&full=1"]M1601783[/URL]: 5920048152491971978196689064497 - 1 = 2^4 x 3 x 191 x 6637 x 10103 x 53017 x 1601783 x 113399107

and one is P+1 smooth:

[URL="https://www.mersenne.org/report_exponent/?exp_lo=296663&full=1"]M296663[/URL]: 33472736879943425145991507583 + 1 = 2^7 x 3 x 3 x 7 x 79 x 3361 x 41897 x 9979727 x 37388971

 Uncwilly 2021-04-23 12:37

I ran some P+1 and when submitting a result I see PrimeNet error 13: [C]Server database full or broken.[/C]

P+1 found a composite factor for [M]123031[/M] 120815644174984431693267614423021994991

 ATH 2021-04-23 13:09

5th factor out of 957 curves: [M]1602143[/M] 43496906104874570142712609

P-1 smooth again, so it is really only 2 P+1 factors and 3 P-1 factors found by "P+1" test.

P+1 = 2 x 5 x 7 x 11 x 56489488447889052133393

P-1 = 2^5 x 3^3 x 15241 x 17977 x 1602143 x 114686597

 ixfd64 2021-04-23 13:12

[QUOTE=Uncwilly;576604]I ran some P+1 and when submitting a result I see PrimeNet error 13: [C]Server database full or broken.[/C]

P+1 found a composite factor for [M]123031[/M] 120815644174984431693267614423021994991[/QUOTE]

That's a product of the previously known factors 2214559 and 54555170656995109045759275062449.

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