is 2 2035447 - 1
has 612731 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-L3A65B3CAAD670EB1double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26829.283469.1176%40000002000000001.39948.7549%30.682971.8214%2.7037%
PrimeNet2580.018963.7931%90001500000.00162.6157%0.020564.7402%0.9471%
GPU722620.301866.1290%90001200000.00141.3283%0.303366.5790%0.4499%
Difference+6+28.9816+2.9886%+3991000+199880000+1.3980+7.4266%+30.3796+5.2424%+5.2424%

Known prime factors (1 factor, 98.2 bits, 0.00482498% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
20354473665571346667241380808398491433098.21090043399476066961724093
7 × 17 × 28597 × 26459671381192351
2020-01-0728597264596713811923513.722e+10137,438,148256,696,187

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-24T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.221%
2009-01-30T06:15:00markrManual testing1000003000000---0.025--2.577%
2014-07-04T02:22:00Jocelyn LaroucheManual testing131533131533---0.013--0.928%
2014-10-17T00:38:00Jocelyn LaroucheManual testing163066163066---0.016--1.045%
2015-10-05T10:48:02Bruno Victal4790K-windows5000001500000012---0.123--4.660%
2019-05-23T08:05:50mikrMSI400000020000000012---1.399--8.755%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-10T00:00:00ANONYMOUSv4_computers21258--0.019--
2016-02-23T16:29:04Mark RoseManual testing258260--0.057--
2009-01-02T10:04:00Sturle Sundegiasha.ifi260261--0.075--
2012-02-10T19:48:00Sebastian HornbostelManual testing261262--0.151--
2013-08-29T08:26:00ramgeisManual testing262263--0.482--
2015-04-13T20:09:00VictordeHollanderManual testing263264--0.965--
2015-04-13T20:09:00VictordeHollanderManual testing264265--1.836--
2015-11-01T21:50:57ramgeisManual testing265266--3.671--
2016-07-29T19:18:38Gordon SpenceManual testing266267--7.343--
2019-03-20T02:02:09chuenkitManual testing267268--14.69--


ECM factoring results:

Old Calculation Method

Total ECM effort:4.408 GHz-days
Estimated T-Level:2.600
DigitsB1CurvesCompleteFacMiss
201100052 / 1000.52059.297%
255000052 / 2800.18683.023%

New Calculation Method

Total ECM effort:4.408 GHz-days
Estimated T-Level:2.600
DigitsB1CompleteFacMiss
20110002.00013.534%
25500000.18583.106%
302500000.01298.840%


ECM Summary

B1B2factorcurvesGHz-days
500005000000514.323
50000500000010.085


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-17T00:00:00ANONYMOUSv4_computers3A65B3CAAD670EB10.134
2016-07-15T17:46:50Mark Rosemichelangelo3A65B3CAAD670EB10.134


PRP results:
dateuseridcompidcofactorsres64PRP
2020-01-08T04:23:00mrhx
366557134666724138080839849143
6FFE066F856EBAA4no
2020-01-09T02:15:25Ivan MLAB
366557134666724138080839849143
6FFE066F856EBAA4no


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 = 500000 (P-1 stage 1)
B1 = 100000, B2 = 3000000 (P-1 stage 2)
B1 = 163066 (P-1 stage 1)
B1 = 131533 (P-1 stage 1)
B1 = 100000 (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: 2020-01-09T02:15:25+00:00