is 2 3743897 - 1
has 1127026 decimal digits
takes 0.393 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L95A164E5075CB124double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27063.824068.5714%1600000660000000.77806.1476%64.602070.5035%1.9321%
PrimeNet2600.041063.3333%160003200000.00503.0900%0.046064.4663%1.1330%
GPU722640.950765.6250%220004500000.00692.1101%0.957666.3503%0.7253%
Difference+6+62.8733+2.9464%+1578000+65550000+0.7711+4.0375%+63.6444+4.1532%+4.1532%

Known prime factors (1 factor, 129.9 bits, 0.00346873% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
3743897124021541803986167108805754408555249111940129.866165631615672100710982174128199247
3 × 44170017893 × 1249955086980315424993
2022-01-274417001789312499550869803154249934.174e+101.037e+131.937e+13

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-07T04:43:00Carsten Kossendeyleela20000265000---0.005--0.730%
2013-03-05T23:56:00Squeeky_SquirrelE8400_30001100002035000---0.033--2.075%
2015-11-08T10:04:23mikrMSI16000006600000012---0.778--6.148%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-01-13T00:00:00ANONYMOUSv4_computers21260--0.041--
2009-03-05T06:52:00S485122USB-A260261--0.041--
2011-05-08T12:21:00markrManual testing21262--0.164--
2012-05-10T01:21:00GrunwalderGIMPManual testing21263--0.426--
2016-02-23T16:29:38Mark RoseManual testing262263--0.262--
2015-01-23T13:17:00VictordeHollanderManual testing263264--0.524--
2015-01-23T13:17:00VictordeHollanderManual testing264265--0.998--
2016-02-26T10:03:30ramgeisManual testing265266--1.996--
2016-11-05T16:44:58Gordon SpenceManual testing266267--3.992--
2018-07-23T16:23:30TJAOIManual testing267268--7.984--
2020-12-09T01:38:34axnManual testing268269--15.97--
2021-03-20T01:45:12axnManual testing269270--31.94--


ECM factoring results:

Old Calculation Method

Total ECM effort:4.034 GHz-days
Estimated T-Level:1.350
DigitsB1CurvesCompleteFacMiss
201100027 / 1000.27076.234%
255000027 / 2800.09690.792%

New Calculation Method

Total ECM effort:4.034 GHz-days
Estimated T-Level:1.350
DigitsB1CompleteFacMiss
20110000.87141.855%
25500000.07992.430%
302500000.00599.516%


ECM Summary

B1B2factorcurvesGHz-days
500005000000263.885
50000500000010.149


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-02-24T00:00:00ANONYMOUSv4_computers95A164E5075CB1240.393
1999-11-04T00:00:00MadPoov4_computers95A164E5075CB1240.393


PRP results:
dateuseridcompidcofactorsres64PRP
2022-02-03T06:54:15_p95holder_TFL16_PRPt11-E_b
1240215418039861671088057544085552491119
63730079B4AE47EEno
2022-02-03T21:46:45Oliver Kruse11700K
1240215418039861671088057544085552491119
63730079B4AE47EEno


P-1 factor-bounds graph:
B1 = 1600000, B2 = 66000000 (P-1 stage 2)
B1 = 1600000 (P-1 stage 1)
B1 = 110000, B2 = 2035000 (P-1 stage 2)
B1 = 110000 (P-1 stage 1)
B1 = 20000, B2 = 265000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-02-03T21:46:45+00:00