is 2 1882579 - 1
has 566713 decimal digits
takes 0.102 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LC910CC12E1086EF8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.783668.6567%500000150000000.10155.0859%15.885170.2508%1.5941%
PrimeNet2570.010263.1579%90001600000.00143.0329%0.011664.2753%1.1174%
GPU722610.163265.5738%100001500000.00141.6919%0.164666.1562%0.5825%
Difference+6+15.6205+3.0829%+490000+14850000+0.1001+3.3940%+15.7205+4.0946%+4.0946%

Known prime factors (1 factor, 66.5 bits, 0.00353097% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18825791024416083870982419932166.47327207784742924
22 × 43 × 2953 × 53567489
2016-07-1029535356748913.6940.22980.4288

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-15T06:11:00markrtiny2750006000000---0.046--3.931%
2015-10-07T17:34:25Bruno Victal5820K-linux5000001500000012---0.101--5.086%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:28:56Mark RoseManual testing21260--0.082--
2010-04-01T14:41:00Architects CubedManual testing260261--0.082--
2016-02-23T16:28:56Mark RoseManual testing261262--0.163--
2011-03-08T05:15:00GrunwalderGIMPManual testing21263--0.848--
2016-02-23T16:28:56Mark RoseManual testing262263--0.521--
2015-05-09T22:18:00snme2pm1Manual testing263264--1.043--
2015-05-09T22:18:00snme2pm1Manual testing264265--1.985--
2015-09-12T12:52:00ramgeisManual testing265266--3.969--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.304 GHz-days
Estimated T-Level:24.732
DigitsB1CurvesCompleteFacMiss
2011000265 / 1002.6506.972%
2550000265 / 2800.94638.747%

New Calculation Method

Total ECM effort:20.304 GHz-days
Estimated T-Level:24.732
DigitsB1CompleteFacMiss
20110009.0360.012%
25500000.81844.110%
302500000.05195.063%
3510000000.00299.767%


ECM Summary

B1B2factorcurvesGHz-days
500005000000443.049
50000500000020.139
50000660000021917.12


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computersC910CC12E1086EF80.102
1999-03-15T00:00:00curtiscv4_computersC910CC12E1086EF80.102
2016-06-02T10:52:59MadPooManual testingC910CC12E1086EF80.102


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T14:11:36Oliver KruseGTX-2
102441608387098241993
EAE646723175C3__no
2017-11-11T12:55:30kkmrkkblmbrbkc4.xlarge
102441608387098241993
EAE646723175C3__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
TF factor-bounds graph:
267
266
265
264
263
262
261
260
250
260
270
280
290
2100
Last modified: 2021-10-14T13:12:57+00:00