is 2 1447861 - 1
has 435850 decimal digits
takes 0.055 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LB386A3830E533635double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26720.522668.6567%500000150000000.07144.9273%20.594070.2011%1.5444%
PrimeNet2560.006662.5000%70001200000.00072.9033%0.007463.5888%1.0888%
GPU722600.106165.0000%6500900000.00061.3960%0.106765.4886%0.4886%
Difference+7+20.4166+3.6567%+493500+14910000+0.0708+3.5312%+20.4874+4.7125%+4.7125%

Known prime factors (2 factors, 128.3 bits, 0.00886100% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
144786116319925874766355431960.501563587453311
3 × 1609 × 116757293
2010-04-1216091167572930.13340.35230.6578
14478612558019663122425635672167.79488337888206203
3 × 29445962735401
2019-03-0832944596273540140.91388,817165,885

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
144786141746691288352790020092371966246906188139128.295
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers15000243750---0.002--0.838%
2016-03-17T19:14:27alpertronManual testing5000001500000012---0.071--4.927%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-10-13T00:00:00ANONYMOUSv4_computers21257--0.013--
2003-07-21T00:00:00ANONYMOUSv4_computers21258--0.027--


ECM factoring results:

Old Calculation Method

Total ECM effort:26.383 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000300 / 1003.0004.904%
2550000300 / 2801.07134.186%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:26.383 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.6150.000%
25500001.67118.807%
302500000.14386.643%
3510000000.01099.006%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000021810.32
500005000000321.514
250000400000005014.55


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-29T00:00:00ANONYMOUSv4_computersB386A3830E5336350.055


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T01:13:00Oliver KruseGTX-1
1631992587476635543
350DCAD3042D31__no
2017-11-04T23:37:39kkmrkkblmbrbkc4.xlarge
1631992587476635543
350DCAD3042D31__no
2019-03-09T12:23:25treborLaptop
1631992587476635543
255801966312242563567
79CC273C517AB0BBno
2019-03-10T02:23:10kkmrkkblmbrbkc5.large
1631992587476635543
255801966312242563567
79CC273C517AB0BBno


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 15000, B2 = 243750 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-01-18T14:04:18+00:00