is 2 1150871 - 1
has 346447 decimal digits
takes 0.034 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26725.818668.6567 %300000100000000.03564.1389 %25.854269.9540 %
Target2600.133565.0000 %50001300000.00050.7709 %0.134065.2698 %
Difference+7+25.6852+3.6567 %+295000+9870000+0.0351+3.3679%+25.7203+4.6841 %

Known prime factors (3 factors, 181.3 bits, 0.01575125% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
11508712301743721.1341
1
-112.428e-134.298e-88.746e-8
11508715289141428571821650815132478.807229788630896591436
22 × 3 × 229 × 5399 × 15488112043
2020-08-2153991548811204359,13236.26567.733
115087130496881864484684585627032581.3351324947881408284881
33 × 112 × 47 × 8628827810069
2017-09-011218628827810069841,94720,20437,736

4 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-17alpertronManual testing3000001000000012
skipped known factor: 2301743
---8.239%


Trial Factoring results:
5758596061626364656667
No TF results for M1150871


ECM factoring results:
Total ECM effort:17.747 GHz-days
Estimated T-Level:25.658
DigitsB1CompleteFacMiss
201100014.8080.000%
25500001.62019.795%
302500000.13287.678%
3510000000.00999.129%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002689.493
500005000000130.460
25000025000000173.011
25000025000000274.782


Lucas-Lehmer results:
No L-L results for M1150871


PRP results:
dateuseridcompidcofactorsres64
2017-09-29Oliver KruseGTX-2
2301743
3049688186448468458562703
B25E9CD170EBD072
2017-10-17Oliver KruseThreadripper-PC
2301743
3049688186448468458562703
B25E9CD170EBD072
2018-01-02ATHec2-1xh
2301743
3049688186448468458562703
B25E9CD170EBD072
2020-08-21ATHec2-PRPCF
2301743
3049688186448468458562703
528914142857182165081513
23704ACD0E34176A
2020-08-21ANONYMOUSdory
2301743
528914142857182165081513
3049688186448468458562703
23704ACD0E34176A


CERT results:
dateuseridcompid
2020-08-21Ben Deloi-0869cf814f59d2774


P-1 factor-bounds graph:
B1 = 300000, B2 = 10000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
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TF factor-bounds graph:
this exponent TF target: 60
TF double-checked to: 67
ECM T-Level=25.66 ~= 69-bit
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Last modified: 2024-03-13T02:15:48+00:00