is 2 1762477 - 1
has 530559 decimal digits
takes 0.096 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LB1F5B4A4D2523F8Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26833.818869.1176%17624771938724700.96208.0147%34.780871.5928%2.4751%
PrimeNet2570.010963.1579%80001400000.00122.8062%0.012164.1918%1.0339%
GPU722610.174365.5738%80001200000.00111.4531%0.175466.0740%0.5002%
Difference+7+33.6445+3.5439%+1754477+193752470+0.9609+6.5617%+34.6054+5.5188%+5.5188%

Known prime factors (1 factor, 77.2 bits, 0.00437868% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17624771704046276588807515713532477.17348342369193720188
22 × 3 × 2659 × 2843 × 532907077
2020-02-11284353290707717,5472.28414.2657

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:31:00Carsten Kossendeyleela950001591250---0.014--2.146%
2014-04-08T23:01:00Jocelyn LaroucheManual testing100000100000---0.008--0.770%
2014-05-09T20:31:00Jocelyn LaroucheManual testing136417136417---0.011--0.923%
2014-09-17T22:20:00ANONYMOUSManual testing172834172834---0.014--1.052%
2015-05-02T04:25:00mikrMSI247540086660000---0.556--7.325%
2018-07-10T16:02:43Jocelyn Larouchelow 4M17624778812385012---0.509--7.129%
2018-08-13T11:55:08Jocelyn Larouchelow 4M176247717624770012---0.886--7.907%
2018-10-19T02:38:32Jocelyn Larouchelow 4M176247719387247012---0.962--8.015%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:50Mark RoseManual testing258260--0.065--
2010-04-20T13:12:00Architects Cubedm1_f2260261--0.087--
2016-02-23T16:28:50Mark RoseManual testing261262--0.174--
2010-12-13T03:32:00GrunwalderGIMPManual testing21263--0.906--
2016-02-23T16:28:50Mark RoseManual testing262263--0.557--
2015-04-29T21:07:00snme2pm1Manual testing263264--1.114--
2015-04-29T21:07:00snme2pm1Manual testing264265--2.120--
2015-09-07T08:31:00ramgeisManual testing265266--4.240--
2018-04-30T12:03:46TJAOIManual testing266267--8.480--
2019-08-16T11:17:51TJAOIManual testing267268--16.96--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.264 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.264 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025017.20
50000500000010.069


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-07T00:00:00ANONYMOUSv4_computersB1F5B4A4D2523F8F0.096
2015-07-18T19:04:00MadPooManual testingB1F5B4A4D2523F8F0.096


PRP results:
dateuseridcompidcofactorsres64PRP
2020-02-12T00:53:30Niels_Mache_NextcloudSuperDry-X
170404627658880751571353
4332F17A7BBD0429no
2020-02-12T07:53:31Jinyuan WangManual testing
170404627658880751571353
4332F17A7BBD0429no
2020-02-12T13:42:02GunnarLuFeininger
170404627658880751571353
4332F17A7BBD0429no


P-1 factor-bounds graph:
B1 = 1762477, B2 = 193872470 (P-1 stage 2)
B1 = 1762477, B2 = 176247700 (P-1 stage 2)
B1 = 2475400, B2 = 86660000 (P-1 stage 2)
B1 = 1762477, B2 = 88123850 (P-1 stage 2)
B1 = 2475400 (P-1 stage 1)
B1 = 1762477 (P-1 stage 1)
B1 = 95000, B2 = 1591250 (P-1 stage 2)
B1 = 172834 (P-1 stage 1)
B1 = 136417 (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: 2020-09-11T10:24:29+00:00