is 2 1961347 - 1
has 590425 decimal digits
takes 0.106 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LA62C6363B475977Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26830.389869.1176%19613472451683751.19668.4558%31.586471.7290%2.6113%
PrimeNet2580.019663.7931%80001400000.00122.4695%0.020864.6872%0.8941%
GPU722620.313266.1290%8000900000.00101.1545%0.314266.5201%0.3911%
Difference+6+30.0765+2.9886%+1953347+245078375+1.1956+7.3013%+31.2722+5.2089%+5.2089%

Known prime factors (1 factor, 72.6 bits, 0.00370301% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
196134773027000805564799953532272.6291861654281612708
22 × 3 × 11 × 14103441527369
2020-01-091114103441527369752.3360,444112,892

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-04-13T10:14:00kurlyslice100000030000000---0.203--5.700%
2018-01-29T11:07:16Jocelyn Larouchelow 4M19613473000000012---0.274--6.055%
2018-02-13T12:59:54Jocelyn Larouchelow 4M19613476000000012---0.403--6.840%
2018-03-04T11:00:59Jocelyn Larouchelow 4M196134712000000012---0.660--7.633%
2018-05-16T11:47:05Jocelyn Larouchelow 4M196134719613470012---0.986--8.198%
2018-11-26T12:53:58Jocelyn LaroucheManual testing196134724516837512---1.197--8.456%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-21T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:29:00Mark RoseManual testing258260--0.059--
2010-01-09T14:40:00S485122USB-W260261--0.078--
2016-02-23T16:29:00Mark RoseManual testing261262--0.157--
2011-08-27T22:19:00GrunwalderGIMPManual testing21263--0.814--
2016-02-23T16:29:00Mark RoseManual testing262263--0.501--
2015-04-19T12:31:00lycornManual testing263264--1.001--
2015-04-19T12:32:00lycornManual testing264265--1.905--
2015-09-08T08:29:00ramgeisManual testing265266--3.810--
2018-01-08T13:22:29TJAOIManual testing266267--7.620--
2019-05-14T12:32:11chuenkitManual testing267268--15.24--


ECM factoring results:

Old Calculation Method

Total ECM effort:4.456 GHz-days
Estimated T-Level:3.200
DigitsB1CurvesCompleteFacMiss
201100064 / 1000.64052.560%
255000064 / 2800.22979.534%

New Calculation Method

Total ECM effort:4.456 GHz-days
Estimated T-Level:3.200
DigitsB1CompleteFacMiss
20110002.06512.688%
25500000.18782.978%
302500000.01198.858%


ECM Summary

B1B2factorcurvesGHz-days
500005000000634.386
50000500000010.070


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-26T00:00:00PHeedev4_computersA62C6363B475977C0.106
2015-06-28T05:06:00MadPooManual testingA62C6363B475977C0.106


PRP results:
dateuseridcompidcofactorsres64PRP
2020-01-09T18:27:12Christoph ZengerManual testing
7302700080556479995353
093C1ABC5A5AD07Eno
2020-01-10T08:52:42Chang Chia-Tchehomura
7302700080556479995353
093C1ABC5A5AD07Eno


P-1 factor-bounds graph:
B1 = 1961347, B2 = 245168375 (P-1 stage 2)
B1 = 1961347, B2 = 196134700 (P-1 stage 2)
B1 = 1961347, B2 = 120000000 (P-1 stage 2)
B1 = 1961347, B2 = 60000000 (P-1 stage 2)
B1 = 1961347, B2 = 30000000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1961347 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-01-10T08:52:42+00:00