is 2 1721011 - 1
has 518076 decimal digits
takes 0.081 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LEF70D0873AD97AFBdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.265468.6567%1500000650000000.33847.2722%17.603870.9361%2.2794%
PrimeNet2570.011263.1579%80001400000.00102.7936%0.012264.1871%1.0292%
GPU722610.178565.5738%70001100000.00091.3438%0.179366.0364%0.4626%
Difference+6+17.0869+3.0829%+1493000+64890000+0.3376+5.9284%+17.4245+4.8997%+4.8997%

Known prime factors (1 factor, 82.0 bits, 0.00476673% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
172101149579190913799602751406892582.0361440408890872853304
23 × 3 × 13 × 68897 × 67008652961
2016-09-186889767008652961742,077249.14465.31

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:40:00Carsten Kossendeyleela900001507500---0.011--2.356%
2014-04-04T00:13:00Jocelyn LaroucheManual testing100000100000---0.007--0.885%
2014-05-03T14:50:00Jocelyn LaroucheManual testing150000150000---0.010--1.110%
2014-10-06T21:12:00Jocelyn LaroucheManual testing187294187294---0.013--1.248%
2015-01-09T22:25:00Jocelyn LaroucheManual testing280941280941---0.019--1.525%
2015-02-12T12:33:00Jocelyn LaroucheManual testing373931373931---0.026--1.741%
2015-02-20T07:32:00David Campeaui5-2500k150000065000000---0.338--7.272%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:48Mark RoseManual testing258260--0.067--
2010-04-23T13:43:00Architects CubedManual testing260261--0.089--
2016-02-23T16:28:48Mark RoseManual testing261262--0.178--
2010-10-27T20:37:00GrunwalderGIMPManual testing21263--0.927--
2016-02-23T16:28:48Mark RoseManual testing262263--0.570--
2015-05-03T17:07:00snme2pm1Manual testing263264--1.141--
2015-05-03T17:07:00snme2pm1Manual testing264265--2.171--
2015-09-02T13:37:00ramgeisManual testing265266--4.342--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.939 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.939 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024914.82
50000500000020.119


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-06T00:00:00ANONYMOUSv4_computersEF70D0873AD97AFB0.081
2015-07-18T19:04:00MadPooManual testingEF70D0873AD97AFB0.081


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T04:08:12Oliver KruseGTX-2
4957919091379960275140689
9965FA218297CD__no
2017-11-03T14:34:37srow7sys2b
4957919091379960275140689
9965FA218297CD__no


P-1 factor-bounds graph:
B1 = 1500000, B2 = 65000000 (P-1 stage 2)
B1 = 1500000 (P-1 stage 1)
B1 = 373931 (P-1 stage 1)
B1 = 280941 (P-1 stage 1)
B1 = 187294 (P-1 stage 1)
B1 = 90000, B2 = 1507500 (P-1 stage 2)
B1 = 150000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
250
260
270
280
290
2100
Last modified: 2020-04-20T10:39:33+00:00