is 2 2232887 - 1
has 672166 decimal digits
takes 0.147 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L4887952C87478F79double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26826.694167.6471%2000000650000000.51797.0376%27.212069.9239%2.2769%
PrimeNet2580.017262.0690%100001800000.00182.8709%0.019063.1579%1.0890%
GPU722620.275164.5161%110001800000.00191.6318%0.277165.0951%0.5790%
Difference+6+26.4189+3.1309%+1989000+64820000+0.5160+5.4059%+26.9349+4.8288%+4.8288%

Known prime factors (1 factor, 86.6 bits, 0.00387957% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
22328871194310858696900218928030812786.62626743647544566747420
22 × 3 × 5 × 445727459076112457
2020-07-2054457274590761124578,203,4172.315e+94.324e+9

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-03-27T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.227%
2010-10-26T20:54:00Oscar Östlin7501175011---0.007--0.675%
2011-01-13T21:34:00Oscar Östlin850001615000---0.016--2.185%
2014-05-26T23:57:00Jocelyn LaroucheManual testing113745113745---0.011--0.869%
2014-09-30T23:23:00Jocelyn LaroucheManual testing142490142490---0.014--0.987%
2015-11-26T09:47:44Alexander DubrovinManual testing13000001100000012---0.174--4.871%
2016-01-07T10:33:51Alexander DubrovinManual testing20000006500000012---0.518--7.038%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-02-07T00:00:00ANONYMOUSv4_computers21258--0.017--
2016-02-23T16:29:09Mark RoseManual testing258260--0.052--
2009-01-11T07:18:00Sturle Sundemorovan.ifi260261--0.069--
2012-04-20T16:48:00Sebastian HornbostelManual testing261262--0.138--
2013-01-23T08:24:00dbaughManual testing262263--0.440--
2015-03-10T10:44:00VictordeHollanderManual testing263264--0.879--
2015-03-10T10:44:00VictordeHollanderManual testing264265--1.673--
2015-10-25T20:35:11ramgeisManual testing265266--3.347--
2016-12-24T00:01:01Gordon SpenceManual testing266267--6.693--
2019-04-08T13:40:38TJAOIManual testing267268--13.39--


ECM factoring results:

Old Calculation Method

Total ECM effort:7.634 GHz-days
Estimated T-Level:4.450
DigitsB1CurvesCompleteFacMiss
201100089 / 1000.89040.882%
255000089 / 2800.31872.729%

New Calculation Method

Total ECM effort:7.634 GHz-days
Estimated T-Level:4.450
DigitsB1CompleteFacMiss
20110002.8715.664%
25500000.25977.146%
302500000.01698.415%


ECM Summary

B1B2factorcurvesGHz-days
500005000000877.463
50000500000020.172


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-14T00:00:00ANONYMOUSv4_computers4887952C87478F790.147
2018-04-20T16:46:44kkmrkkblmbrbkold4887952C87478F790.147


PRP results:
dateuseridcompidcofactorsres64PRP
2020-07-21T06:54:10argusdustyArgus-PC
119431085869690021892803081
AF9FAEDAFE2514CCno
2020-07-22T01:29:36marssystemssystem03
119431085869690021892803081
AF9FAEDAFE2514CCno


P-1 factor-bounds graph:
B1 = 2000000, B2 = 65000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 1300000, B2 = 11000000 (P-1 stage 2)
B1 = 1300000 (P-1 stage 1)
B1 = 85000, B2 = 1615000 (P-1 stage 2)
B1 = 142490 (P-1 stage 1)
B1 = 113745 (P-1 stage 1)
B1 = 85000 (P-1 stage 1)
B1 = 75011 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-07-22T01:29:36+00:00