is 2 1971911 - 1
has 593605 decimal digits
takes 0.130 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.068668.6567%----15.068668.6567%0.0000%
PrimeNet2580.019563.7931%80001400000.00142.4721%0.020964.6882%0.8951%
GPU722620.311666.1290%80001000000.00121.1961%0.312866.5342%0.4051%
Difference+5+14.7570+2.5277%-8000-100000-0.0012-1.1961%+14.7558+2.1225%+2.1225%

Known prime factors (3 factors, 188.5 bits, 0.00955770% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1971911973096313425031446.46824673941
32 × 127 × 21587
-127215877.986e-60.00010.0002
19719112322480332422355296092167.65458889075937564
22 × 3 × 4907422994797
2021-07-254490742299479718.69125,49047,609
1971911240321755775467387759932374.3476093625822247236
22 × 7 × 13 × 83 × 4801 × 42011153
2021-01-284801420111532,022.50.21860.4076

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
19719112259997049482332113090675987667132735114.122
1971911233856214580937726738176115957693047937120.815
1971911558142551241731582497271158812244076987673743142.002
197191154312645897896990321802307171024733120276152395913
9052711
57188.469
P-1 results:
No P-1 results for M1971911


Trial Factoring results:
No TF results for M1971911


ECM factoring results:

Old Calculation Method

Total ECM effort:3.924 GHz-days
Estimated T-Level:2.150
DigitsB1CurvesCompleteFacMiss
201100043 / 1000.43064.910%
255000043 / 2800.15485.740%

New Calculation Method

Total ECM effort:3.924 GHz-days
Estimated T-Level:2.150
DigitsB1CompleteFacMiss
20110001.44823.508%
25500000.13187.750%
302500000.00899.196%


ECM Summary

B1B2factorcurvesGHz-days
500005000000131.098
50000500000040.338
50000570000050.446
500006750000141.349
50000715000070.694


Lucas-Lehmer results:
No L-L results for M1971911


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T10:50:59Oliver KruseGTX-3
97309631342503
28B82C6C3A2D4B__no
2017-11-12T02:23:43ATHec2-1xf
97309631342503
28B82C6C3A2D4B__no
2021-01-28T21:50:36mrhlanai
97309631342503
24032175577546738775993
67C0993F722EA32Bno
2021-07-26T05:01:29SRJ2877LTOS
97309631342503
232248033242235529609
24032175577546738775993
67C0993F722EA32Bno


P-1 factor-bounds graph:
100
101
102
103
104
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
TF factor-bounds graph:
267
240
250
260
270
280
290
2100
Last modified: 2022-05-21T19:56:08+00:00