is 2 1388659 - 1
has 418029 decimal digits
takes 0.053 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
Actual26721.397668.6567%500000150000000.07144.9024%21.469070.1933%1.5366%
PrimeNet2560.006962.5000%65001100000.00072.7578%0.007663.5342%1.0342%
GPU722600.110665.0000%5500700000.00051.2015%0.111165.4205%0.4205%
Difference+7+21.2870+3.6567%+494500+14930000+0.0709+3.7010%+21.3579+4.7728%+4.7728%

Known prime factors (5 factors, 281.6 bits, 0.02027977% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1388659252624845291134.5569096
23 × 3 × 379
-83793.245e-91.562e-62.138e-6
1388659107259243510971443.2863861972
22 × 33 × 35759
2008-07-1527357591.624e-60.00010.0002
13886591571852367379519972092167.09156596053004356
22 × 3 × 353 × 839 × 15924589
2015-01-188391592458921.8450.04810.0897
13886593482503031987555248492168.239125390863847336
23 × 3823 × 4099884379
2018-08-093823409988437970.28112.36723.097
13886594016976762555451137612168.445144635103454320
24 × 32 × 5 × 239 × 3691 × 227719
2015-01-18369122771985.4140.00090.0013

26 Composite Factors:
exponentprime factorscomposite factordigitsbits*
13886592709634979788123266783132477.842
1388659397088961127971475663701367956131101.647
1388659879766789677812065855113756112131102.795
13886591014788133174095908684880750356932103.0009
1388659168595695836054610069667848008827334110.377
1388659373530640735644535628395398390935334111.525
1388659430857888752843050906496297014581734111.731
13886595473980635235994885385537020964257814644141135.330
13886596314094433931305748216344595693105949304941135.536
138865913989133755022912377223227371516496734708942136.683
13886594259146157714319307284111622491723121682841744144.933
13886599436312032691677260155728044945794510089973744146.081
138865910884540748816300678290522128926659083656519345146.287
138865913828635110969491305597525719246631170441392589112
89
52169.886
138865915950971295183462411308417469362984907627289455389
21
52170.092
138865935340027506037799997012439345238483402886260356860
81
52171.240
138865958713502192911182294486077060254927485766729596499
5777
54178.616
138865967724499244029820146111301972728920250254629710702
4753
54178.822
138865915004639039375327040403513472754916918006327758969
06633
55179.970
138865921988853010421518611641499434011668575737620422697
597862274601
62203.774
138865914832489407918263161855532437405919064051988741344
969942012834033
65213.172
138865917108891143865755270557892855981115277329323913772
450279882546337
65213.378
138865937905446159544862118250911702271415164981521653505
927915119980857
65214.526
138865955549305898622868969527893874608203380004710069167
2506441175580512147929
72238.331
138865923585077395717274199301615816674769903974476253045
3627201178354107349587297
75247.061
138865959581765282457525031790793217344807492379002195343
63648521701741206602554284997428113
85281.617
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2015-01-19T11:24:00alpertronManual testing500000150000001241135.5360.0710.1060.1434.902%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-07-15T09:59:00J FeitsmaManual testing??43.286147.80274e-70.1151.68801e-6


ECM factoring results:

Old Calculation Method

Total ECM effort:25.329 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000301 / 1003.0104.855%
2550000301 / 2801.07534.064%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:25.329 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.2630.000%
25500001.35725.749%
302500000.11389.315%
3510000000.00899.236%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024911.70
50000500000020.094
250000350000005013.54


Lucas-Lehmer results:
No L-L results for M1388659


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T13:34:27Oliver KruseGTX-3
25262484529
10725924351097
157185236737951997209
401697676255545113761
1250AE90CF3D05C5no
2017-10-05T21:42:16Oliver KruseManual testing
25262484529
10725924351097
157185236737951997209
401697676255545113761
1250AE90CF3D05__no
2017-10-25T09:11:11Chang Chia-Tchehomura
25262484529
10725924351097
157185236737951997209
401697676255545113761
1250AE90CF3D05__no
2018-08-09T15:17:29ATHec2-PRPCF
25262484529
10725924351097
157185236737951997209
348250303198755524849
401697676255545113761
C3518CDB4824DB__no
2018-08-12T07:18:16Oliver KruseGTX-1
25262484529
10725924351097
157185236737951997209
348250303198755524849
401697676255545113761
C3518CDB4824DB__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
109
1010
TF factor-bounds graph:
267
2
230
240
250
260
270
280
290
2100
Last modified: 2021-09-03T08:15:28+00:00