is 2 1878697 - 1
has 565545 decimal digits
takes 0.102 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
Actual26715.816268.6567%500000150000000.10155.0846%15.917770.2504%1.5937%
PrimeNet2570.010263.1579%90001600000.00143.0317%0.011664.2748%1.1169%
GPU722610.163565.5738%100001500000.00141.6912%0.164966.1560%0.5822%
Difference+6+15.6527+3.0829%+490000+14850000+0.1001+3.3934%+15.7528+4.0944%+4.0944%

Known prime factors (4 factors, 144.0 bits, 0.00766426% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
187869786420063826.36523
23
-1234.782e-121.729e-71.729e-7
187869770789302971032.7211884
22 × 3 × 157
2008-07-1541574.288e-109.704e-71.268e-6
187869715164353722791340.464403587
32 × 44843
2008-07-159448431.058e-70.00020.0004
1878697238440465846011444.4396345900
22 × 32 × 52 × 11 × 641
2014-01-10256411.960e-64.607e-65.127e-6

11 Composite Factors:
exponentprime factorscomposite factordigitsbits*
18786976117616022393487111859.086
18786971310504404077796335772166.829
187869720606040080161532498632270.804
1878697107347403002682870368632373.185
18786971687903437708113925564972477.160
1878697361579556591572359036756792684.903
18786979276969330378242826277837823693099.550
18786971458687214246517810585020179931132103.524
1878697312477280601557485370151411074777734111.267
187869725595964779319076272530593773514666336117.623
18786972212004888774535668573899083334545193069976944143.988
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:39:08alpertronManual testing5000001500000012-
skipped known factor: 86420063
skipped known factor: 7078930297
skipped known factor: 1516435372279
skipped known factor: 23844046584601
--0.101--5.085%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-07-15T07:47:00J FeitsmaManual testing??40.464132.77945e-80.2175.93074e-8
2008-07-15T07:47:00J FeitsmaManual testing??32.721101.24195e-100.2172.65006e-10
2014-01-10T14:40:00TJAOIManual testing??44.439147.12834e-70.2171.52102e-6


ECM factoring results:

Old Calculation Method

Total ECM effort:19.827 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:19.827 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
201100010.6280.002%
25500000.97837.597%
302500000.06293.981%
3510000000.00399.709%


ECM Summary

B1B2factorcurvesGHz-days
500005000000382.632
50000660000021316.64
50000672109770.552


Lucas-Lehmer results:
No L-L results for M1878697


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T13:15:11Oliver KruseGTX-3
86420063
7078930297
1516435372279
23844046584601
E2E7797B5E3F3E16no
2017-10-05T21:45:35Oliver KruseManual testing
86420063
7078930297
1516435372279
23844046584601
E2E7797B5E3F3E__no
2017-11-11T04:15:32kkmrkkblmbrbkc4.xlarge
86420063
7078930297
1516435372279
23844046584601
E2E7797B5E3F3E__no


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: 2021-10-20T13:17:49+00:00