is 2 2032543 - 1
has 611857 decimal digits
takes 0.134 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L8D5B17C131C3C3F3double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26829.325369.1176%40000002000000001.39948.7537%30.724771.8210%2.7034%
PrimeNet2580.018963.7931%90001500000.00162.6150%0.020564.7399%0.9468%
GPU722620.302366.1290%90001200000.00141.3279%0.303766.5788%0.4498%
Difference+6+29.0230+2.9886%+3991000+199880000+1.3980+7.4258%+30.4210+5.2422%+5.2422%

Known prime factors (1 factor, 79.7 bits, 0.00392309% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
203254310084519498314486395587372579.738248076412118082776
23 × 31009551514760347
2020-05-2783100955151476034767,225161,071,363300,836,451

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-24T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.221%
2009-01-27T06:55:00markrManual testing40000010000000---0.088--4.184%
2015-10-05T07:54:16Bruno Victal4790K-windows5000001500000012---0.123--4.659%
2019-05-05T19:45:02mikrMSI400000020000000012---1.399--8.754%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-02T00:00:00ANONYMOUSv4_computers21258--0.019--
2016-02-23T16:29:04Mark RoseManual testing258260--0.057--
2009-01-03T06:38:00Sturle Sundeghini.ifi260261--0.076--
2012-02-09T06:47:00Sebastian HornbostelManual testing261262--0.151--
2013-08-28T20:48:00ramgeisManual testing262263--0.483--
2015-04-13T20:09:00VictordeHollanderManual testing263264--0.966--
2015-04-13T20:09:00VictordeHollanderManual testing264265--1.838--
2015-11-01T21:50:56ramgeisManual testing265266--3.677--
2016-07-29T19:18:37Gordon SpenceManual testing266267--7.353--
2019-03-20T02:02:08chuenkitManual testing267268--14.71--


ECM factoring results:

Old Calculation Method

Total ECM effort:8.475 GHz-days
Estimated T-Level:21.786
DigitsB1CurvesCompleteFacMiss
2011000100 / 1001.00036.603%
2550000100 / 2800.35769.923%

New Calculation Method

Total ECM effort:8.475 GHz-days
Estimated T-Level:21.786
DigitsB1CompleteFacMiss
20110003.2263.972%
25500000.29274.711%
302500000.01898.221%


ECM Summary

B1B2factorcurvesGHz-days
500005000000998.390
50000500000010.085


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10T00:00:00ANONYMOUSv4_computers8D5B17C131C3C3F30.134
2016-07-15T16:49:55Mark Roseraphael8D5B17C131C3C3F30.134


PRP results:
dateuseridcompidcofactorsres64PRP
2020-05-27T12:14:45CrypticCluecruncher
1008451949831448639558737
FC0D3DD5B2A373B1no
2020-06-06T09:39:00oodairacom2
1008451949831448639558737
FC0D3DD5B2A373B1no


P-1 factor-bounds graph:
B1 = 4000000, B2 = 200000000 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 400000, B2 = 10000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 400000 (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: 2020-06-06T09:39:00+00:00