is 2 1889501 - 1
has 568797 decimal digits
takes 0.103 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L5A68E0494FC9B03Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.725868.6567%500000150000000.10155.0881%15.827370.2515%1.5948%
PrimeNet2570.010263.1579%90001600000.00143.0349%0.011564.2760%1.1181%
GPU722610.162665.5738%100001600000.00141.7254%0.164066.1678%0.5940%
Difference+6+15.5632+3.0829%+490000+14840000+0.1000+3.3627%+15.6633+4.0837%+4.0837%

Known prime factors (1 factor, 70.3 bits, 0.00371958% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
188950114349552925157051928792270.281379718055855939
3 × 5203147 × 24326179
2015-12-09520314724326179135.750.49120.8330

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-19T01:36:00markrtiny2750006000000---0.046--3.933%
2015-10-07T22:25:46Bruno Victal5820K-linux5000001500000012---0.101--5.088%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.020--
2010-04-01T14:42:00Architects CubedManual testing260261--0.081--
2011-03-08T05:15:00GrunwalderGIMPManual testing21263--0.845--
2015-05-11T00:49:00snme2pm1Manual testing263264--1.039--
2015-05-11T00:49:00snme2pm1Manual testing264265--1.977--
2015-09-13T19:11:00ramgeisManual testing265266--3.955--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.440 GHz-days
Estimated T-Level:24.732
DigitsB1CurvesCompleteFacMiss
2011000265 / 1002.6506.972%
2550000265 / 2800.94638.747%

New Calculation Method

Total ECM effort:20.440 GHz-days
Estimated T-Level:24.732
DigitsB1CompleteFacMiss
20110009.0630.012%
25500000.82044.022%
302500000.05195.051%
3510000000.00299.767%


ECM Summary

B1B2factorcurvesGHz-days
500005000000281.941
50000500000020.139
50000616854670.531
50000660000022117.28
50000661857470.548


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00bezaharv4_computers5A68E0494FC9B03F0.103
2015-06-29T14:43:00MadPooManual testing5A68E0494FC9B03F0.103


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:30:48alpertronManual testing
1434955292515705192879
B0DA8C352B5141__no
2017-10-19T22:48:59Oliver KruseThreadripper
1434955292515705192879
B0DA8C352B5141__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)
104
105
106
107
104
105
106
107
108
TF factor-bounds graph:
267
266
265
264
263
261
258
250
260
270
280
290
2100
Last modified: 2021-11-04T11:47:52+00:00