is 2 2238703 - 1
has 673917 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-L59410C5A1E9889A9double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26826.624767.6471%2000000650000000.51797.0396%27.142669.9246%2.2775%
PrimeNet2580.017262.0690%100001800000.00182.8723%0.019063.1585%1.0895%
GPU722620.274464.5161%110001900000.00201.6583%0.276465.1046%0.5884%
Difference+6+26.3503+3.1309%+1989000+64810000+0.5159+5.3813%+26.8662+4.8200%+4.8200%

Known prime factors (1 factor, 70.3 bits, 0.00314198% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
223870314939113026053209792792270.340333655536845513
5701 × 58525791413
2020-02-17570158525791413109.35304.00567.78

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-03-27T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.228%
2010-11-08T17:48:00Oscar Östlin7501175011---0.007--0.675%
2011-01-14T08:39:00Oscar Östlin850001636250---0.016--2.193%
2014-06-01T23:28:00Jocelyn LaroucheManual testing113670113670---0.011--0.869%
2014-09-30T23:23:00Jocelyn LaroucheManual testing142340142340---0.014--0.987%
2015-12-02T19:19:05Alexander DubrovinManual testing100000060000006---0.121--4.166%
2016-01-10T16:25:13Alexander DubrovinManual testing20000006500000012---0.518--7.040%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-02-07T00:00:00ANONYMOUSv4_computers21258--0.017--
2016-02-23T16:29:09Mark RoseManual testing258260--0.051--
2009-01-11T04:20:00Sturle Sundegoscha.ifi260261--0.069--
2012-04-27T06:47:00Sebastian HornbostelManual testing261262--0.137--
2013-01-23T08:24:00dbaughManual testing262263--0.438--
2015-03-10T10:44:00VictordeHollanderManual testing263264--0.877--
2015-03-10T10:44:00VictordeHollanderManual testing264265--1.669--
2015-10-25T20:35:12ramgeisManual testing265266--3.338--
2016-12-30T02:46:28Gordon SpenceManual testing266267--6.676--
2019-04-08T13:40:37TJAOIManual testing267268--13.35--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.518 GHz-days
Estimated T-Level:2.050
DigitsB1CurvesCompleteFacMiss
201100041 / 1000.41066.228%
255000041 / 2800.14686.356%

New Calculation Method

Total ECM effort:3.518 GHz-days
Estimated T-Level:2.050
DigitsB1CompleteFacMiss
20110001.32326.645%
25500000.12088.733%
302500000.00799.267%


ECM Summary

B1B2factorcurvesGHz-days
500005000000393.347
50000500000020.172


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-15T00:00:00ANONYMOUSv4_computers59410C5A1E9889A90.147
2018-04-21T15:49:37kkmrkkblmbrbkold59410C5A1E9889A90.147


PRP results:
dateuseridcompidcofactorsres64PRP
2020-02-18T17:31:58Christoph ZengerManual testing
1493911302605320979279
BCCA2847167FB390no
2020-02-18T17:43:15AbsolutXTR750D
1493911302605320979279
BCCA2847167FB390no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 65000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 1000000, B2 = 6000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 85000, B2 = 1636250 (P-1 stage 2)
B1 = 142340 (P-1 stage 1)
B1 = 113670 (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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266
265
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2100
Last modified: 2020-02-18T17:43:15+00:00