is 2 9875087 - 1
has 2972698 decimal digits
takes 2.880 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
Actual2673.009064.1791 %----3.009064.1791 %
Target2686.035964.7059 %6500075000000.19882.5628 %6.234765.6104 %
Difference-1-3.0269-0.5268 %-65000-7500000-0.1988-2.5628 %-3.2257-1.4313 %

Known prime factors (3 factors, 152.9 bits, 0.00154813% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
987508755300487211032.365280
23 × 5 × 7
-886.145e-113.383e-66.886e-6
98750874413176380311238.68322345
5 × 41 × 109
2008-09-08411096.810e-91.891e-53.529e-5
987508743022297255921165991882072581.831217832497353801369
32 × 13 × 61 × 24179 × 1262317603
2022-08-1924179126231760374,80829.09654.324

4 Composite Factors:
P-1 results:
No P-1 results for M9875087


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2022-08-15riccardo ubertiColab_noGPU1520000005000000027--2.370
2022-08-19riccardo ubertiColab_noGPU1523000006000000065P+12581.8312.781


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2008-09-08Will EdgingtonManual testing??
38.683
12


ECM factoring results:
Total ECM effort:8.584 GHz-days
Estimated T-Level:2.500
DigitsB1CompleteFacMiss
20110000.50060.653%
25500000.04895.284%
302500000.00399.688%


ECM Summary

B1B2factorcurvesGHz-days
5000014400000108.584


Lucas-Lehmer results:
No L-L results for M9875087


PRP results:
dateuseridcompidcofactorsres64
2020-09-16riccardo ubertiNomad2C
5530048721
441317638031
C75F5CE0E7759B4D
2021-02-10Oliver KruseIOS-5
5530048721
441317638031
C75F5CE0E7759B4D
2022-08-19riccardo ubertiNomad2C
5530048721
441317638031
4302229725592116599188207
C75F5CE0E7759B4D


CERT results:
dateuseridcompid
2021-02-10workerthreadmiro
2022-08-19Chad SteenersonLulabelle3


P-1 factor-bounds graph:
B1 = 2300000, B2 = 60000000 (P+1 stage 2)
B1 = 2300000 (P+1 stage 1)
100
101
102
103
104
105
106
107
100
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
this exponent TF target: 68
TF double-checked to: 67
ECM T-Level=2.5 ~= -8-bit
250
260
270
280
290
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Last modified: 2024-03-13T02:15:48+00:00