is 2 1635287 - 1
has 492271 decimal digits
takes 0.073 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L4AC0218428EE2348double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26718.170568.6567%1000000200000000.13185.6820%18.302370.4376%1.7809%
PrimeNet2570.011763.1579%70001200000.00092.5590%0.012664.1007%0.9428%
GPU722610.187865.5738%6500700000.00061.1191%0.188565.9590%0.3853%
Difference+6+17.9826+3.0829%+993500+19930000+0.1312+4.5629%+18.1138+4.4786%+4.4786%

Known prime factors (1 factor, 75.9 bits, 0.00464258% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1635287714580265954576724355192375.92021848772293627257
11 × 1986252026693387
2013-11-171119862520266933875,202.97,008,82113,090,526

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-02-29T16:08:00AxonManual testing100000100000---0.006--0.876%
2012-02-29T17:11:00AxonManual testing200000200000---0.013--1.280%
2012-02-29T18:06:00AxonManual testing300000300000---0.019--1.560%
2012-02-29T18:11:00AxonManual testing400000400000---0.026--1.780%
2012-02-29T19:08:00AxonManual testing500000500000---0.032--1.962%
2012-02-29T19:11:00AxonManual testing600000600000---0.039--2.118%
2012-02-29T20:08:00AxonManual testing700000700000---0.045--2.255%
2012-02-29T20:11:00AxonManual testing800000800000---0.052--2.378%
2012-02-29T21:07:00AxonManual testing900000900000---0.058--2.489%
2012-02-29T21:12:00AxonManual testing10000001000000---0.065--2.591%
2012-03-01T06:06:00AxonManual testing10000008000000---0.089--4.718%
2012-03-01T07:07:00AxonManual testing100000020000000---0.132--5.682%
2016-03-17T19:17:41alpertronManual testing5000001500000012---0.084--5.000%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-07T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-06-17T00:00:00ANONYMOUSv4_computers21258--0.023--
2010-05-02T08:49:00Architects Cubedi4l_1260261--0.094--
2010-09-26T01:51:00GrunwalderGIMPManual testing21263--0.976--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.047 GHz-days
Estimated T-Level:24.464
DigitsB1CurvesCompleteFacMiss
2011000250 / 1002.5008.106%
2550000250 / 2800.89340.883%

New Calculation Method

Total ECM effort:14.047 GHz-days
Estimated T-Level:24.464
DigitsB1CompleteFacMiss
20110008.0650.031%
25500000.72948.246%
302500000.04595.611%
3510000000.00299.795%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000025014.05


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13T00:00:00ANONYMOUSv4_computers4AC0218428EE23480.073


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T16:01:53Oliver KruseGTX-2
71458026595457672435519
73837CE6DE64F0__no
2017-11-01T23:25:47kkmrkkblmbrbkc4.xlarge
71458026595457672435519
73837CE6DE64F0__no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 20000000 (P-1 stage 2)
B1 = 1000000, B2 = 8000000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 900000 (P-1 stage 1)
B1 = 800000 (P-1 stage 1)
B1 = 700000 (P-1 stage 1)
B1 = 600000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 400000 (P-1 stage 1)
B1 = 300000 (P-1 stage 1)
B1 = 200000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
1014
1015
1016
TF factor-bounds graph:
267
263
261
258
257
250
260
270
280
290
2100
Last modified: 2019-11-18T17:50:27+00:00