is 2 3845119 - 1
has 1157497 decimal digits
takes 0.404 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP09B393FD03DEC307verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26931.048968.1159%150000007500000008.382811.1439%39.431771.6691%3.5531%
PrimeNet2600.039963.3333%170003400000.00533.1943%0.045264.5046%1.1713%
GPU722640.925765.6250%240005000000.00762.2278%0.933366.3908%0.7658%
Difference+5+30.1232+2.4909%+14976000+749500000+8.3752+8.9161%+38.4984+5.2783%+5.2783%

Known prime factors (1 factor, 75.8 bits, 0.00197119% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
3845119655369656265962644972392375.7958522098487276501
31 × 43 × 4789 × 1334970173
2021-10-27478913349701732,111.111.07720.688

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-27T16:22:00Carsten Kossendeyleela20000270000---0.005--0.860%
2011-10-25T11:44:00Squeeky_SquirrelT7500_2200700001137500---0.020--1.846%
2014-10-18T13:18:00Jocelyn LaroucheManual testing8669286692---0.013--0.708%
2016-02-03T10:08:10Jocelyn LaroucheManual testing23950023950006---0.054--2.780%
2020-11-23T01:55:57Carlos PinhoHomeComputer17300046750006---0.064--3.085%
2021-02-08T02:50:19axnManual testing15000000750000000---8.383--11.144%
2022-03-03T00:13:25Jocelyn LaroucheManual testing9000090000---0.014--0.725%
2022-03-22T11:10:06Jocelyn LaroucheManual testing100000100000---0.015--0.773%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:41Mark RoseManual testing21260--0.040--
2009-02-26T16:01:00S485122USB-A260261--0.040--
2011-03-05T11:07:00markrut261262--0.080--
2012-02-20T20:14:00GrunwalderGIMPManual testing21263--0.415--
2016-02-23T16:29:41Mark RoseManual testing262263--0.255--
2015-01-18T21:00:00VictordeHollanderManual testing263264--0.511--
2015-01-18T21:00:00VictordeHollanderManual testing264265--0.972--
2016-02-28T22:17:22ramgeisManual testing265266--1.943--
2016-11-21T15:09:27Gordon SpenceManual testing266267--3.887--
2018-08-13T14:25:17TJAOIManual testing267268--7.774--
2020-10-26T10:35:17TJAOIManual testing268269--15.55--


ECM factoring results:

Old Calculation Method

Total ECM effort:2.254 GHz-days
Estimated T-Level:0.750
DigitsB1CurvesCompleteFacMiss
201100015 / 1000.15086.006%
255000015 / 2800.05494.775%

New Calculation Method

Total ECM effort:2.254 GHz-days
Estimated T-Level:0.750
DigitsB1CompleteFacMiss
20110000.48461.639%
25500000.04495.721%
302500000.00399.731%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.803
50000500000030.451


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-09-07T00:00:00Stephen Woodv4_computersE59C751B215355__0.404


PRP results:
dateuseridcompidcofactorsres64PRP
2021-11-02T02:37:52LaurVZero818
65536965626596264497239
09B393FD03DEC307no


P-1 factor-bounds graph:
B1 = 15000000, B2 = 750000000 (P-1 stage 2)
B1 = 15000000 (P-1 stage 1)
B1 = 173000, B2 = 4675000 (P-1 stage 2)
B1 = 239500, B2 = 2395000 (P-1 stage 2)
B1 = 239500 (P-1 stage 1)
B1 = 173000 (P-1 stage 1)
B1 = 70000, B2 = 1137500 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 86692 (P-1 stage 1)
B1 = 70000 (P-1 stage 1)
B1 = 20000, B2 = 270000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-22T11:10:06+00:00