is 2 1447777 - 1
has 435825 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-L672C0937C8717A6Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26720.523868.6567%2000000600000000.28577.2278%20.809570.9222%2.2654%
PrimeNet2560.006662.5000%70001200000.00072.9033%0.007463.5887%1.0887%
GPU722600.106165.0000%6500900000.00061.3960%0.106765.4886%0.4886%
Difference+7+20.4177+3.6567%+1993500+59910000+0.2851+5.8318%+20.7028+5.4336%+5.4336%

Known prime factors (2 factors, 151.9 bits, 0.01049361% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1447777198773282772250276445772374.0746864775541131344
24 × 3 × 43 × 1297 × 2564346293
2015-05-06129725643462932,724.97.734814.446
14477772724833840808592822663032477.85194104058871241663
3 × 89 × 139 × 852409 × 2974639
2015-05-09852409297463924,7250.05360.0960

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1447777541624167546443215995599504854850395054778883146151.924
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers15000243750---0.002--0.838%
2010-07-02T14:24:00Rob_Deetwopc100000200000---0.006--1.216%
2010-07-03T14:46:00Rob_Deetwopc200000300000---0.011--1.519%
2010-07-04T13:19:00Rob_Deetwopc2000001000000---0.013--2.332%
2010-07-05T12:24:00Rob_Deetwopc2000002000000---0.017--2.819%
2010-07-06T12:42:00Rob_Deetwopc2000003000000---0.020--3.110%
2010-07-07T12:32:00Rob_Deetwopc2000004000000---0.023--3.320%
2010-07-08T13:20:00Rob_Deetwopc2000005000000---0.026--3.484%
2014-11-17T02:17:00Jocelyn LaroucheManual testing244333244333---0.014--1.386%
2015-01-28T11:16:00Jocelyn LaroucheManual testing325206325206---0.018--1.589%
2015-01-30T21:42:00Jocelyn LaroucheManual testing357726357726---0.020--1.661%
2015-02-13T18:00:00Jocelyn LaroucheManual testing393498393498---0.022--1.734%
2015-03-02T13:10:00Jocelyn LaroucheManual testing476131476131---0.026--1.886%
2015-03-03T20:46:00Jocelyn LaroucheManual testing523744523744---0.029--1.965%
2015-03-12T10:39:00Jocelyn LaroucheManual testing576118576118---0.032--2.045%
2015-04-08T16:58:00Jocelyn LaroucheManual testing697101697101---0.039--2.212%
2015-05-01T17:20:00Jocelyn LaroucheManual testing843492843492---0.047--2.386%
2015-05-09T13:52:00alpertronManual testing200000060000000122477.8510.2860.1110.5717.228%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-10-13T00:00:00ANONYMOUSv4_computers21257--0.013--
2003-07-21T00:00:00ANONYMOUSv4_computers21258--0.027--
2010-05-10T22:30:00Architects Cubeda3_bu2260261--0.106--
2011-05-07T23:54:00GrunwalderGIMPManual testing21263--1.102--
2015-03-24T23:09:00snme2pm1Manual testing263264--1.356--
2015-03-24T23:09:00snme2pm1Manual testing264265--2.581--


ECM factoring results:

Old Calculation Method

Total ECM effort:26.303 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:26.303 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.2630.000%
25500001.38525.031%
302500000.11689.047%
3510000000.00899.203%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024811.74
50000500000030.142
2500003500000071.910
250000400000004312.51


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-17T00:00:00ANONYMOUSv4_computers672C0937C8717A6E0.055


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T01:20:40Oliver KruseGTX-2
19877328277225027644577
272483384080859282266303
CE427A4CAD657597no
2017-10-05T21:30:58Oliver KruseManual testing
19877328277225027644577
272483384080859282266303
CE427A4CAD6575__no
2017-10-27T10:53:06kkmrkkblmbrbkc4.xlarge
19877328277225027644577
272483384080859282266303
CE427A4CAD6575__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 843492 (P-1 stage 1)
B1 = 697101 (P-1 stage 1)
B1 = 576118 (P-1 stage 1)
B1 = 523744 (P-1 stage 1)
B1 = 476131 (P-1 stage 1)
B1 = 200000, B2 = 5000000 (P-1 stage 2)
B1 = 200000, B2 = 4000000 (P-1 stage 2)
B1 = 393498 (P-1 stage 1)
B1 = 357726 (P-1 stage 1)
B1 = 200000, B2 = 3000000 (P-1 stage 2)
B1 = 325206 (P-1 stage 1)
B1 = 200000, B2 = 2000000 (P-1 stage 2)
B1 = 244333 (P-1 stage 1)
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
107
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
265
264
263
261
258
257
250
260
270
280
290
2100
Last modified: 2022-01-18T14:04:16+00:00