is 2 2017579 - 1
has 607352 decimal digits
takes 0.133 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LAD6A87840FB8CC87double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26714.727568.6567%640000140800000.13085.2102%14.858370.2898%1.6331%
PrimeNet2580.019063.7931%90001500000.00162.6114%0.020664.7386%0.9455%
GPU722620.304566.1290%80001200000.00131.2730%0.305866.5602%0.4312%
Difference+5+14.4230+2.5277%+632000+13960000+0.1295+3.9373%+14.5525+3.7296%+3.7296%

Known prime factors (1 factor, 97.0 bits, 0.00480703% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
20175791568891458588446584473927545673096.98638880545906466279250377
3 × 34157 × 379429749943557487
2017-10-04341573794297499435574871.549e+101.971e+93.681e+9

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-04-28T00:00:00Jocelyn Larouchev4_computers20002000---0.000--0.022%
2002-05-05T00:00:00Jocelyn Larouchev4_computers30003000---0.000--0.040%
2003-02-02T00:00:00ANONYMOUSv4_computers30000547500---0.006--1.426%
2010-12-07T03:13:00Jocelyn LaroucheManual testing201757201757---0.019--1.331%
2013-10-16T15:16:00David Campeaui5-2500k64000014080000---0.131--5.210%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-02T00:00:00ANONYMOUSv4_computers21258--0.019--
2016-02-23T16:29:03Mark RoseManual testing258260--0.057--
2009-01-03T02:59:00Sturle Sundedoak.ifi260261--0.076--
2012-02-03T21:47:00Sebastian HornbostelManual testing261262--0.152--
2013-06-06T07:18:00David CampeauManual testing262263--0.487--
2015-03-15T12:12:00VictordeHollanderManual testing263264--0.973--
2015-03-15T12:12:00VictordeHollanderManual testing264265--1.852--
2015-10-28T09:42:37ramgeisManual testing265266--3.704--
2016-07-16T16:15:45Gordon SpenceManual testing266267--7.408--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.740 GHz-days
Estimated T-Level:2.150
DigitsB1CurvesCompleteFacMiss
201100043 / 1000.43064.910%
255000043 / 2800.15485.740%

New Calculation Method

Total ECM effort:3.740 GHz-days
Estimated T-Level:2.150
DigitsB1CompleteFacMiss
20110001.67618.707%
25500000.15585.611%
302500000.01099.023%


ECM Summary

B1B2factorcurvesGHz-days
500005000000332.794
50000500000030.254
50000706352170.692


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10T00:00:00ANONYMOUSv4_computersAD6A87840FB8CC870.133
2016-07-15T12:12:26Mark RosemichelangeloAD6A87840FB8CC870.133


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T23:26:12Oliver KruseGTX-0
156889145858844658447392754567
2E4A61434E4CCC__no
2017-11-13T21:55:16kkmrkkblmbrbkc4.xlarge
156889145858844658447392754567
2E4A61434E4CCC__no


P-1 factor-bounds graph:
B1 = 640000, B2 = 14080000 (P-1 stage 2)
B1 = 640000 (P-1 stage 1)
B1 = 201757 (P-1 stage 1)
B1 = 30000, B2 = 547500 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
B1 = 3000 (P-1 stage 1)
B1 = 2000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-07-05T01:06:08+00:00