is 2 3931087 - 1
has 1183376 decimal digits
takes 0.490 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
Actual26815.162467.6471 %10000001198606501.35207.6716 %16.514470.1291 %
Target2640.905465.6250 %2600025000000.02912.2811 %0.934566.4091 %
Difference+4+14.2570+2.0221 %+974000+117360650+1.3229+5.3905%+15.5799+3.7199 %

Known prime factors (3 factors, 145.4 bits, 0.00369904% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
393108770759567826.0769
32
-992.279e-121.628e-63.312e-6
393108724983789450201771651.150317772024
23 × 3 × 17 × 29 × 107 × 251
2014-06-181072510.00012.077e-53.938e-5
39310873358012165111753527532168.18642710987636648
23 × 109 × 6857 × 7143137
2022-05-236857714313726.6440.07160.1315

4 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2022-04-17JossManual testing200000200000
skipped known factor: 70759567
skipped known factor: 2498378945020177
--0.0322.163%
2022-05-23JossManual testing20000011986065022168.1861.2158.970%
2022-10-04JossManual testing1000000119860650
skipped known factor: 70759567
skipped known factor: 2498378945020177
skipped known factor: 335801216511175352753
--1.35210.680%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2014-06-18TJAOIManual testing??
51.150
16
5.79474e-5
2022-01-27JossManual testing267268


ECM factoring results:
Total ECM effort:0.474 GHz-days
Estimated T-Level:0.577
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.474


Lucas-Lehmer results:
No L-L results for M3931087


PRP results:
dateuseridcompidcofactorsres64
2017-09-20kkmrkkblmbrbkManual testing
2498378945020177
70759567
E0E0ADD50E08FFD5
2017-12-31Oliver KruseGTX-4
70759567
2498378945020177
E0E0ADD50E08FFD5
2022-05-29XZT3050Micro3
70759567
2498378945020177
335801216511175352753
0294ED11796AEE3D


CERT results:
dateuseridcompid
2022-05-29GIMPS-PRIMLEN-65_10


P-1 factor-bounds graph:
B1 = 1000000, B2 = 119860650 (P-1 stage 2)
B1 = 200000, B2 = 119860650 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 200000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
268
this exponent TF target: 64
TF double-checked to: 67
ECM T-Level=0.58 ~= -15-bit
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00