is 2 4294877 - 1
has 1292887 decimal digits
takes 0.536 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L59D1691B4C92A0BAdouble-checked
PRP1F6C6730BADA75FAPRP-tested

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual271111.313667.6056%620000035561477490351.449413.7777%462.763072.0688%4.4632%
PrimeNet2610.071562.2951%180003600000.00662.9252%0.078163.3980%1.1030%
GPU722651.698764.6154%240004500000.00851.9270%1.707265.2972%0.6819%
Difference+6+109.6149+2.9902%+6176000+35561027490+351.4408+11.8507%+461.0558+6.7716%+3.7813%

Known prime factors (1 factor, 123.7 bits, 0.00287952% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
42948771694308488403104773052486437431341784938123.6721972476148214611004054931535212
22 × 34 × 439 × 1511 × 2663 × 7603 × 1726757 × 262512739
2022-07-1517267572625127393.381e+102.88184.8310

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-08-17T07:51:00Carsten Kossendeydurandal25000337500---0.008--0.753%
2011-12-12T14:08:00Squeeky_SquirrelP4_2600800001420000---0.028--1.593%
2016-12-13T17:34:01Squeeky_SquirrelP4_2600265000775125012---0.122--3.018%
2022-07-15T06:45:28DRobinsonPE5600G62000003556147749038123.672351.41.071702.913.778%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-03-23T00:00:00ANONYMOUSv4_computers21260--0.036--
2002-01-08T00:00:00ANONYMOUSv4_computers21261--0.072--
2010-12-21T10:29:00markroldgamer261262--0.072--
2012-02-03T03:47:00GrunwalderGIMPManual testing21263--0.372--
2016-02-23T16:29:52Mark RoseManual testing262263--0.229--
2014-05-05T16:32:00JayderManual testing263264--0.457--
2014-05-18T00:05:00lycornManual testing264265--0.870--
2015-06-13T23:59:00snme2pm1Manual testing265266--1.740--
2018-04-27T02:07:03chuenkitManual testing266267--3.480--
2018-11-18T03:56:09chuenkitManual testing267268--6.960--
2021-01-22T23:36:57-Anonymous-Manual testing268269--13.92--
2021-01-22T23:36:58-Anonymous-Manual testing269270--27.84--
2021-01-24T00:04:06-Anonymous-Manual testing270271--55.68--


ECM factoring results:
Total ECM effort:2.193 GHz-days
Estimated T-Level:2.308
DigitsB1CompleteFacMiss
20110000.46263.031%
25500000.04395.819%
302500000.00399.731%


ECM Summary

B1B2factorcurvesGHz-days
500005000000122.193


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-04-21T00:00:00ANONYMOUSv4_computers59D1691B4C92A0BA0.536
2000-02-01T00:00:00korvav4_computers59D1691B4C92A0BA0.536


PRP results:
dateuseridcompidcofactorsres64PRP
2022-07-21T09:11:07Poaooffice-CN3
16943084884031047730524864374313417849
1F6C6730BADA75FAno


P-1 factor-bounds graph:
B1 = 6200000, B2 = 35561477490 (P-1 stage 2)
B1 = 6200000 (P-1 stage 1)
B1 = 265000, B2 = 7751250 (P-1 stage 2)
B1 = 265000 (P-1 stage 1)
B1 = 80000, B2 = 1420000 (P-1 stage 2)
B1 = 80000 (P-1 stage 1)
B1 = 25000, B2 = 337500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-07-21T09:11:07+00:00