is 2 1947779 - 1
has 586340 decimal digits
takes 0.106 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
Actual26715.255368.6567%500000150000000.10155.1068%15.356870.2574%1.6006%
PrimeNet2580.019763.7931%80001400000.00122.4662%0.020964.6860%0.8929%
GPU722620.315466.1290%8000900000.00101.1528%0.316466.5195%0.3905%
Difference+5+14.9399+2.5277%+492000+14910000+0.1005+3.9540%+15.0404+3.7378%+3.7378%

Known prime factors (3 factors, 131.6 bits, 0.00675386% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
194777915582233823.8934
22
-445.742e-133.146e-76.404e-7
1947779264118832411134.6206780
22 × 3 × 5 × 113
2008-07-1551131.724e-98.562e-79.306e-7
194777996862231651063408339192273.0362486479001238421
73 × 150617 × 48130091
2021-04-05150617481300911,938.90.21750.3853

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
19477794115561186300571531858.514
19477791509329862486844726515401611273096.930
194777925583139528305813945421920045147933107.657
1947779398642441001571288152213641450865097260740131.550
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:19:11alpertronManual testing5000001500000012-
skipped known factor: 15582233
skipped known factor: 26411883241
--0.101--5.107%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-07-15T07:48:00J FeitsmaManual testing??34.620115.49358e-100.2341.21747e-9


ECM factoring results:

Old Calculation Method

Total ECM effort:20.999 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:20.999 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110009.0760.011%
25500000.80644.642%
302500000.05095.123%
3510000000.00299.770%


ECM Summary

B1B2factorcurvesGHz-days
500005000000352.435
50000500000050.348
50000750000021818.22


Lucas-Lehmer results:
No L-L results for M1947779


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T04:48:51Oliver KruseGTX-2
15582233
26411883241
8EB44A2367805C__no
2017-11-11T10:24:17kkmrkkblmbrbkc4.xlarge
15582233
26411883241
8EB44A2367805C__no
2021-04-07T08:17:59Joe S.VMWare2
15582233
26411883241
9686223165106340833919
C168FDC4A7B9CD5Dno


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
2
220
230
240
250
260
270
280
290
2100
Last modified: 2022-04-28T10:17:53+00:00