is 2 1463641 - 1
has 440600 decimal digits
takes 0.056 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L801DC2B383324EC0double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26720.301468.6567%500000150000000.07144.9337%20.372870.2031%1.5464%
PrimeNet2560.006662.5000%70001200000.00072.9094%0.007363.5910%1.0910%
GPU722600.104965.0000%65001000000.00061.4457%0.105665.5060%0.5060%
Difference+7+20.1964+3.6567%+493500+14900000+0.0708+3.4880%+20.2672+4.6971%+4.6971%

Known prime factors (1 factor, 61.3 bits, 0.00418820% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
146364128391670251265504411961.300969898706420
22 × 5 × 7 × 29 × 281 × 850147
2009-04-022818501470.40700.00260.0048

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers15000243750---0.002--0.840%
2016-03-17T19:14:40alpertronManual testing5000001500000012-
skipped known factor: 2839167025126550441
--0.071--4.934%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-10-06T00:00:00ANONYMOUSv4_computers21257--0.013--
2003-07-30T00:00:00ANONYMOUSv4_computers21258--0.026--


ECM factoring results:

Old Calculation Method

Total ECM effort:25.576 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:25.576 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.65119.189%
302500000.14186.866%
3510000000.01099.021%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000025111.90
250000350000005013.67


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10T00:00:00PHeedev4_computers801DC2B383324EC00.056


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T03:43:55Oliver KruseGTX-2
2839167025126550441
32057C1E51A608__no
2017-11-05T00:55:33kkmrkkblmbrbkc4.xlarge
2839167025126550441
32057C1E51A608__no


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)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
TF factor-bounds graph:
267
258
257
250
260
270
280
290
2100
Last modified: 2022-03-10T10:40:12+00:00