is 2 1755877 - 1
has 528572 decimal digits
takes 0.095 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L553562E843572DE4double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26833.945969.1176%17558771931464700.95848.0045%34.904371.5896%2.4720%
PrimeNet2570.010963.1579%80001400000.00122.8043%0.012164.1910%1.0331%
GPU722610.174965.5738%80001100000.00111.4137%0.176066.0604%0.4867%
Difference+7+33.7710+3.5439%+1747877+193036470+0.9573+6.5909%+34.7283+5.5292%+5.5292%

Known prime factors (1 factor, 71.6 bits, 0.00407809% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
175587735945955792847464707512271.6061023589801359875
53 × 17 × 481689318287
2020-07-08125481689318287429.982,064.43,855.7

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-02T14:15:00Carsten Kossendeyleela950001567500---0.014--2.137%
2014-04-08T23:01:00Jocelyn LaroucheManual testing100000100000---0.008--0.770%
2014-05-06T21:05:00Jocelyn LaroucheManual testing136554136554---0.011--0.923%
2014-09-17T22:20:00ANONYMOUSManual testing173108173108---0.014--1.052%
2015-04-26T01:58:00Squeeky_SquirrelP4_26001300003640000---0.025--2.773%
2015-07-06T11:31:00mikrMSI3642200123456789---0.800--7.977%
2018-10-02T11:45:35Jocelyn Larouchelow 4M175587714047016012---0.733--7.646%
2018-10-03T11:47:46Jocelyn Larouchelow 4M175587715802893012---0.808--7.778%
2018-10-07T10:38:36Jocelyn Larouchelow 4M175587717558770012---0.883--7.897%
2018-10-19T02:38:28Jocelyn Larouchelow 4M175587719314647012---0.958--8.005%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:50Mark RoseManual testing258260--0.066--
2010-04-22T11:32:00Architects Cubedi4l_1260261--0.087--
2016-02-23T16:28:50Mark RoseManual testing261262--0.175--
2010-12-13T03:32:00GrunwalderGIMPManual testing21263--0.909--
2016-02-23T16:28:50Mark RoseManual testing262263--0.559--
2015-05-13T22:52:00snme2pm1Manual testing263264--1.118--
2015-05-13T22:52:00snme2pm1Manual testing264265--2.128--
2015-09-06T20:47:00ramgeisManual testing265266--4.256--
2018-05-28T14:40:34TJAOIManual testing266267--8.512--
2019-06-17T12:15:04TJAOIManual testing267268--17.02--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.945 GHz-days
Estimated T-Level:24.661
DigitsB1CurvesCompleteFacMiss
2011000261 / 1002.6107.257%
2550000261 / 2800.93239.305%

New Calculation Method

Total ECM effort:17.945 GHz-days
Estimated T-Level:24.661
DigitsB1CompleteFacMiss
20110008.4190.022%
25500000.76146.723%
302500000.04795.422%
3510000000.00299.786%


ECM Summary

B1B2factorcurvesGHz-days
50000500000026017.88
50000500000010.069


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-26T00:00:00ANONYMOUSv4_computers553562E843572DE40.095
2015-07-18T19:04:00MadPooManual testing553562E843572DE40.095


PRP results:
dateuseridcompidcofactorsres64PRP
2020-07-09T14:22:04Klaus Nordmannno1
3594595579284746470751
B7236E019BD6BEECno
2020-07-09T14:53:43Alexander Pavlicinoldlaptop
3594595579284746470751
B7236E019BD6BEECno


P-1 factor-bounds graph:
B1 = 1755877, B2 = 193146470 (P-1 stage 2)
B1 = 1755877, B2 = 175587700 (P-1 stage 2)
B1 = 1755877, B2 = 158028930 (P-1 stage 2)
B1 = 3642200, B2 = 123456789 (P-1 stage 2)
B1 = 1755877, B2 = 140470160 (P-1 stage 2)
B1 = 3642200 (P-1 stage 1)
B1 = 1755877 (P-1 stage 1)
B1 = 130000, B2 = 3640000 (P-1 stage 2)
B1 = 95000, B2 = 1567500 (P-1 stage 2)
B1 = 173108 (P-1 stage 1)
B1 = 136554 (P-1 stage 1)
B1 = 130000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-07-27T11:05:33+00:00