is 2 3865481 - 1
has 1163626 decimal digits
takes 0.406 GHz-days to do one PRP test
Last-known PrimeNet details:
0 L-L tests remaining
ResidueStatus
L-L3D9FD6B210B78435double-checked
PRP7A0E543A102767__double-checked

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26930.885468.1159%150000007500000008.382811.1486%39.268279.2645%15.9312%
PrimeNet2600.039763.3333%170003400000.00533.1972%0.045066.5305%3.1972%
GPU722640.920865.6250%240005000000.00762.2299%0.928467.8549%2.2299%
Difference+5+29.9646+2.4909%+14976000+749500000+8.3752+8.9187%+38.3398+11.4097%+11.4097%

Known prime factors (2 factors, 205.9 bits, 0.00532578% known):
Remaining cofactor is not a probable-prime

GHz-days
exponentfactordigitsbits*kmin B1min B2date foundmin. TFmin. P-1normal P-1
38654812200780423518898615861692477.54228467096637118364
22 × 32 × 31 × 125383 × 203441863
1253832034418632021-03-2211,8671.70613.1527
386548142615375683138120995580054703041992899139128.32555122992045670540090069068639895
33 × 5 × 23 × 1087 × 16657 × 177791 × 13526869 × 407697259
135268694076972592021-03-224.362e+105.33056.3180

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
386548193787084544353687348484146830436095506958398058547
079607725479
62205.867
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2000-12-31T00:00:00willmorev4_computers20000265000---0.005--0.856%
2011-10-19T19:26:00Squeeky_SquirrelT7500_2200700001137500---0.020--1.847%
2014-10-22T23:53:00Jocelyn LaroucheManual testing8660486604---0.013--0.709%
2016-02-27T08:03:42Jocelyn LaroucheManual testing22999622999606---0.052--2.739%
2020-11-23T08:38:51Carlos PinhoHomeComputer17400046990006---0.064--3.094%
2021-03-22T07:09:08axnManual testing1500000075000000062205.8678.3830.81216.7711.149%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:41Mark RoseManual testing21260--0.040--
2009-02-25T11:09:00S485122USB-Z260261--0.040--
2011-02-19T19:20:00markrut261262--0.079--
2012-02-29T05:41:00GrunwalderGIMPManual testing21263--0.413--
2016-02-23T16:29:41Mark RoseManual testing262263--0.254--
2015-01-14T12:12:00VictordeHollanderManual testing263264--0.508--
2015-01-14T12:12:00VictordeHollanderManual testing264265--0.967--
2016-02-28T22:17:29ramgeisManual testing265266--1.933--
2016-11-25T21:25:04Gordon SpenceManual testing266267--3.866--
2019-01-25T16:37:16YxinityManual testing267268--7.733--
2020-10-05T08:51:40TJAOIManual testing268269--15.47--


ECM factoring results:
Total ECM effort:1.805 GHz-days
Estimated T-Level:0.600
DigitsB1CurvesCompleteFacMiss
201100012 / 1000.12088.638%
255000012 / 2800.04395.797%

ECM Summary

B1B2factorcurvesGHz-days
500005000000121.805


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-12-15T00:00:00ANONYMOUSv4_computers0D5CF68A87010E__0.406
2001-01-08T00:00:00willmorev4_computers3D9FD6B210B784350.406


PRP results:
dateuseridcompidcofactorsres64PRP
2021-03-22T22:41:56XZTN4640G2
220078042351889861586169
426153756831381209955800547030419928991
7A0E543A102767__no


P-1 factor-bounds graph:
B1 = 15000000, B2 = 750000000 (stage 2)
B1 = 15000000 (stage 1)
B1 = 174000, B2 = 4699000 (stage 2)
B1 = 229996, B2 = 2299960 (stage 2)
B1 = 229996 (stage 1)
B1 = 174000 (stage 1)
B1 = 70000, B2 = 1137500 (stage 2)
B1 = 86604 (stage 1)
B1 = 70000 (stage 1)
B1 = 20000, B2 = 265000 (stage 2)
B1 = 20000 (stage 1)
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103
104
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109
TF factor-bounds graph:
269
268
267
266
265
264
263
262
261
260
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270
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2100
2110
2120
2130
Last modified: 2021-03-22T22:41:56+00:00