is 2 1447217 - 1
has 435656 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-L87AAF8CDAA4698C6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26720.531868.6567%500000150000000.07144.9270%20.603270.2010%1.5443%
PrimeNet2560.006662.5000%70001200000.00072.9031%0.007463.5887%1.0887%
GPU722600.106165.0000%6000900000.00061.3566%0.106765.4748%0.4748%
Difference+7+20.4256+3.6567%+494000+14910000+0.0708+3.5704%+20.4965+4.7262%+4.7262%

Known prime factors (1 factor, 70.8 bits, 0.00489543% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
144721721243816067671488707672270.848733954067277799
3109 × 236074000411
2013-08-173109236074000411296.69712.061,329.9

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers15000243750---0.002--0.838%
2010-07-02T13:09:00Rob_Deetwopc100000200000---0.006--1.216%
2010-07-03T12:55:00Rob_Deetwopc200000300000---0.011--1.519%
2010-07-04T12:35:00Rob_Deetwopc2000001000000---0.013--2.332%
2010-07-05T11:35:00Rob_Deetwopc2000002000000---0.017--2.819%
2010-07-06T11:53:00Rob_Deetwopc2000003000000---0.020--3.110%
2010-07-07T11:44:00Rob_Deetwopc2000004000000---0.023--3.319%
2010-07-08T12:34:00Rob_Deetwopc2000005000000---0.026--3.484%
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--
2010-05-12T04:40:00Architects Cubeda3_bu2260261--0.106--
2011-05-07T23:54:00GrunwalderGIMPManual testing21263--1.103--


ECM factoring results:

Old Calculation Method

Total ECM effort:25.474 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:25.474 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.2310.000%
25500001.35425.824%
302500000.11389.331%
3510000000.00899.237%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000025011.83
250000350000005013.64


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-26T00:00:00ANONYMOUSv4_computers87AAF8CDAA4698C60.055


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T01:06:27Oliver KruseGTX-0
2124381606767148870767
C6ED653ABA38E0__no
2017-10-27T11:49:47kkmrkkblmbrbkold
2124381606767148870767
C6ED653ABA38E0__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 200000, B2 = 5000000 (P-1 stage 2)
B1 = 200000, B2 = 4000000 (P-1 stage 2)
B1 = 200000, B2 = 3000000 (P-1 stage 2)
B1 = 200000, B2 = 2000000 (P-1 stage 2)
B1 = 200000, B2 = 1000000 (P-1 stage 2)
B1 = 200000, B2 = 300000 (P-1 stage 2)
B1 = 200000 (P-1 stage 1)
B1 = 100000, B2 = 200000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 15000, B2 = 243750 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
267
263
261
258
257
250
260
270
280
290
2100
Last modified: 2021-11-19T10:17:14+00:00