is 2 4385281 - 1
has 1320102 decimal digits
takes 0.547 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L5E58D01123ACB7BEdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual273436.196568.4932%620000028879919250285.615611.8777%721.812172.2354%3.7423%
Target2651.663764.6154%260005000000.00942.0306%1.673165.3339%0.7185%
Difference+8+434.5328+3.8778%+6174000+28879419250+285.6062+9.8471%+720.1391+6.9015%+3.0238%

Known prime factors (1 factor, 124.1 bits, 0.00282888% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
43852812208648042409589423673090515878193596938124.0552518251444331149387773657510064
24 × 32 × 13 × 251 × 20897 × 40763 × 4806413 × 1309026259
2022-12-23480641313090262593.144e+1013.72024.090

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-26T18:44:00Carsten Kossendeydurandal25000356250---0.008--0.567%
2012-01-09T08:59:00Squeeky_SquirrelT7500_22001100002255000---0.041--1.511%
2017-04-25T02:57:27Squeeky_Squirreli5-5250U_1600270000796500012---0.125--2.458%
2022-12-23T13:26:07DRobinsonPE5700G62000002887991925038124.055285.61.094571.211.878%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-24T00:00:00ANONYMOUSv4_computers21261--0.070--
2010-11-11T03:47:00markroldgamer261262--0.070--
2012-02-29T05:44:00GrunwalderGIMPManual testing21263--0.364--
2016-02-23T16:38:50Mark RoseManual testing262263--0.224--
2014-07-22T18:05:00JayderManual testing263264--0.448--
2014-07-23T09:40:00lycornManual testing264265--0.852--
2015-06-20T00:25:00snme2pm1Manual testing265266--1.704--
2018-05-04T02:09:47chuenkitManual testing266267--3.408--
2018-10-29T01:12:53chuenkitManual testing267268--6.816--
2021-01-25T11:36:47-Anonymous-Manual testing268269--13.63--
2021-01-25T11:36:47-Anonymous-Manual testing269270--27.26--
2021-01-30T11:27:43-Anonymous-Manual testing270271--54.53--
2021-01-30T11:27:43-Anonymous-Manual testing271272--109.1--
2021-02-11T16:47:59-Anonymous-Manual testing272273--218.1--


ECM factoring results:
Total ECM effort:2.204 GHz-days
Estimated T-Level:2.308
DigitsB1CompleteFacMiss
20110000.46263.031%
25500000.04395.819%
302500000.00399.731%


ECM Summary

B1B2factorcurvesGHz-days
500005000000122.204


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-02-16T00:00:00ANONYMOUSv4_computers5E58D01123ACB7BE0.547


PRP results:
dateuseridcompidcofactorsres64PRP
2022-12-30T06:03:58kutens
22086480424095894236730905158781935969
3AA9732B62C4DBE1no


P-1 factor-bounds graph:
B1 = 6200000, B2 = 28879919250 (P-1 stage 2)
B1 = 6200000 (P-1 stage 1)
B1 = 270000, B2 = 7965000 (P-1 stage 2)
B1 = 270000 (P-1 stage 1)
B1 = 110000, B2 = 2255000 (P-1 stage 2)
B1 = 110000 (P-1 stage 1)
B1 = 25000, B2 = 356250 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-12-30T06:03:58+00:00