is 2 1931383 - 1
has 581405 decimal digits
takes 0.105 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
Actual26715.384868.6567%500000150000000.10155.1016%15.486370.2557%1.5990%
PrimeNet2580.019963.7931%80001400000.00122.4622%0.021164.6846%0.8915%
GPU722620.318166.1290%8000900000.00101.1507%0.319166.5188%0.3898%
Difference+5+15.0667+2.5277%+492000+14910000+0.1005+3.9509%+15.1672+3.7369%+3.7369%

Known prime factors (2 factors, 105.5 bits, 0.00546112% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
193138330902129824.8818
23
-881.159e-126.293e-71.281e-6
193138318247889094773212384467112580.594472404724872622685
5 × 11 × 13 × 811 × 9661 × 84326729
2020-11-06966184326729143,3860.36210.6750

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
19313835638986227843750348492002294771932105.475
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:40:42alpertronManual testing5000001500000012-
skipped known factor: 30902129
--0.101--5.102%


Trial Factoring results:
No TF results for M1931383


ECM factoring results:

Old Calculation Method

Total ECM effort:19.895 GHz-days
Estimated T-Level:24.589
DigitsB1CurvesCompleteFacMiss
2011000257 / 1002.5707.555%
2550000257 / 2800.91839.872%

New Calculation Method

Total ECM effort:19.895 GHz-days
Estimated T-Level:24.589
DigitsB1CompleteFacMiss
201100010.6090.002%
25500000.97737.661%
302500000.06293.990%
3510000000.00399.709%


ECM Summary

B1B2factorcurvesGHz-days
500005000000271.876
50000500000040.278
50000660000021216.63
50000669230670.553
50000690000070.561


Lucas-Lehmer results:
No L-L results for M1931383


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T01:23:08Oliver KruseGTX-0
30902129
4790D861D80345__no
2017-11-11T00:02:04kkmrkkblmbrbkold
30902129
4790D861D80345__no
2020-11-08T03:35:19Ethan O'ConnorHighland2020
30902129
1824788909477321238446711
F0315B2E537BED10no
2020-11-09T19:34:27fre_gamesgpu
30902129
1824788909477321238446711
F0315B2E537BED10no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
TF factor-bounds graph:
267
220
230
240
250
260
270
280
290
2100
Last modified: 2022-03-24T12:31:37+00:00