is 2 1670623 - 1
has 502908 decimal digits
takes 0.079 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L2D4F7DF18B08B8A8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.786168.6567%1000000200000000.13895.6958%17.925070.4420%1.7853%
PrimeNet2570.011563.1579%70001200000.00092.5697%0.012464.1046%0.9467%
GPU722610.183965.5738%7000800000.00071.2069%0.184665.9892%0.4155%
Difference+6+17.6023+3.0829%+993000+19920000+0.1381+4.4889%+17.7404+4.4527%+4.4527%

Known prime factors (1 factor, 98.1 bits, 0.00586915% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
16706233283849728089326756092699060313098.05198282189581052300731305
33 × 5 × 23 × 533523559 × 59327987599
2013-03-25533523559593279875994.878e+10255.00411.98

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-02-29T17:09:00AxonManual testing100000100000---0.007--0.880%
2012-02-29T17:13:00AxonManual testing200000200000---0.014--1.284%
2012-02-29T18:09:00AxonManual testing300000300000---0.020--1.566%
2012-02-29T18:12:00AxonManual testing400000400000---0.027--1.786%
2012-02-29T19:10:00AxonManual testing500000500000---0.034--1.968%
2012-02-29T19:13:00AxonManual testing600000600000---0.041--2.124%
2012-02-29T20:09:00AxonManual testing700000700000---0.048--2.262%
2012-02-29T20:12:00AxonManual testing800000800000---0.055--2.385%
2012-02-29T21:10:00AxonManual testing900000900000---0.061--2.497%
2012-02-29T21:14:00AxonManual testing10000001000000---0.068--2.599%
2012-03-01T06:08:00AxonManual testing10000008000000---0.094--4.730%
2012-03-01T07:09:00AxonManual testing100000020000000---0.139--5.696%
2016-03-17T19:18:11alpertronManual testing5000001500000012---0.088--5.013%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-21T00:00:00ANONYMOUSv4_computers21257--0.011--
2010-04-25T16:40:00Architects Cubedm1_f2260261--0.092--
2010-08-31T00:27:00GrunwalderGIMPManual testing21263--0.955--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.774 GHz-days
Estimated T-Level:24.446
DigitsB1CurvesCompleteFacMiss
2011000249 / 1002.4908.188%
2550000249 / 2800.88941.030%

New Calculation Method

Total ECM effort:14.774 GHz-days
Estimated T-Level:24.446
DigitsB1CompleteFacMiss
20110008.0320.032%
25500000.72648.387%
302500000.04595.628%
3510000000.00299.796%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000024914.77


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-21T00:00:00ANONYMOUSv4_computers2D4F7DF18B08B8A80.079


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T02:28:56Oliver KruseDoppelherz
328384972808932675609269906031
B6F4DAB9470B2A__no
2017-11-02T23:33:00kkmrkkblmbrbkc4.xlarge
328384972808932675609269906031
B6F4DAB9470B2A__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)
104
105
106
107
108
109
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
267
263
261
257
250
260
270
280
290
2100
Last modified: 2019-12-16T13:28:20+00:00