is 2 1965781 - 1
has 591760 decimal digits
takes 0.107 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
Actual26715.115668.6567%----15.115668.6567%0.0000%
PrimeNet2580.019563.7931%80001400000.00122.4706%0.020764.6876%0.8945%
GPU722620.312566.1290%80001000000.00101.1953%0.313666.5339%0.4049%
Difference+5+14.8031+2.5277%-8000-100000-0.0010-1.1953%+14.8020+2.1228%+2.1228%

Known prime factors (2 factors, 110.4 bits, 0.00561748% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19657819693659267211239.818246560
25 × 5 × 23 × 67
-32675.097e-82.667e-65.123e-6
196578118007095407494119615672270.609458013771816243
3 × 967 × 157881341543
2021-09-30967157881341543219.58676.641,263.8

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1965781174554647272390003896019739033180734110.427
P-1 results:
No P-1 results for M1965781


Trial Factoring results:
No TF results for M1965781


ECM factoring results:

Old Calculation Method

Total ECM effort:3.068 GHz-days
Estimated T-Level:2.100
DigitsB1CurvesCompleteFacMiss
201100042 / 1000.42065.566%
255000042 / 2800.15086.048%

New Calculation Method

Total ECM effort:3.068 GHz-days
Estimated T-Level:2.100
DigitsB1CompleteFacMiss
20110001.39524.793%
25500000.12688.167%
302500000.00899.226%


ECM Summary

B1B2factorcurvesGHz-days
500005000000251.741
50000500000030.209
50000675000070.556
50000690000070.562


Lucas-Lehmer results:
No L-L results for M1965781


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T09:21:24Oliver KruseGTX-0
969365926721
437008369D90B1__no
2017-11-11T22:31:44ATHec2-1xf
969365926721
437008369D90B1__no
2021-10-01T11:13:07JackBlockWin10
969365926721
1800709540749411961567
40E27AA7F5F5EB57no


P-1 factor-bounds graph:
100
101
102
103
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
267
230
240
250
260
270
280
290
2100
Last modified: 2022-04-11T10:06:37+00:00