is 2 1860503 - 1
has 560068 decimal digits
takes 0.101 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L5AFAD9B2C254D6F3double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26832.037069.1176%25798892046553301.06908.4096%33.106071.7147%2.5971%
PrimeNet2570.010363.1579%90001600000.00143.0263%0.011764.2728%1.1149%
GPU722610.165165.5738%90001500000.00131.6328%0.166466.1359%0.5621%
Difference+7+31.8719+3.5439%+2570889+204505330+1.0677+6.7768%+32.9395+5.5788%+5.5788%

Known prime factors (1 factor, 84.0 bits, 0.00451616% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1860503196583478339955839946464232684.0235283073403804128237
222644407 × 23728749691
2020-08-02222644407237287496912,806,381118.26189.94

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-05T05:12:00markrtiny2750006000000---0.046--3.534%
2015-10-07T02:45:10Bruno Victal5820K-linux5000001500000012---0.101--4.609%
2016-09-14T01:57:19Jocelyn Larouchelow 4M5000003000000012---0.166--5.222%
2016-09-30T05:55:09Jocelyn Larouchelow 4M500000330000006---0.179--5.307%
2016-10-07T05:52:37Jocelyn Larouchelow 4M500000396000006---0.207--5.471%
2016-10-29T20:53:45Jocelyn Larouchelow 4M600000600000---0.047--1.923%
2016-12-19T18:36:36Jocelyn Larouchelow 4M720000720000---0.057--2.075%
2016-12-29T21:51:16Jocelyn Larouchelow 4M864000864000---0.068--2.233%
2017-01-14T05:24:36Jocelyn Larouchelow 4M10368001036800---0.082--2.398%
2017-02-11T17:53:09Jocelyn Larouchelow 4M12441601244160012---0.146--4.879%
2017-03-22T07:27:52Jocelyn Larouchelow 4M14929921492992012---0.175--5.142%
2017-03-29T03:10:19Jocelyn Larouchelow 4M17915901791590012---0.210--5.410%
2017-04-01T17:06:27Jocelyn Larouchelow 4M21499082149908012---0.252--5.685%
2017-05-06T15:58:38Jocelyn Larouchelow 4M25798892579889012---0.302--5.966%
2018-02-11T01:49:14Jocelyn Larouchelow 4M25798895159778012---0.413--6.778%
2018-02-26T11:01:56Jocelyn Larouchelow 4M257988910319556012---0.634--7.597%
2018-09-17T11:34:54Jocelyn Larouchelow 4M257988918605030012---0.989--8.296%
2018-10-25T11:45:57Jocelyn LaroucheManual testing257988920465533012---1.069--8.410%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:55Mark RoseManual testing258260--0.062--
2010-04-06T01:39:00Architects CubedManual testing260261--0.083--
2016-02-23T16:28:55Mark RoseManual testing261262--0.165--
2011-03-08T05:14:00GrunwalderGIMPManual testing21263--0.858--
2016-02-23T16:28:55Mark RoseManual testing262263--0.528--
2015-05-07T03:46:00snme2pm1Manual testing263264--1.055--
2015-05-07T03:46:00snme2pm1Manual testing264265--2.008--
2015-09-09T11:47:00ramgeisManual testing265266--4.017--
2018-05-14T16:20:06TJAOIManual testing266267--8.033--
2019-07-08T14:45:02TJAOIManual testing267268--16.07--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.270 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:18.270 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.3240.024%
25500000.75347.088%
302500000.04695.458%
3510000000.00299.787%


ECM Summary

B1B2factorcurvesGHz-days
50000500000014710.17
50000500000020.138
5000066000001027.960


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13T00:00:00ANONYMOUSv4_computers5AFAD9B2C254D6F30.101
2015-07-16T04:00:00MadPooManual testing5AFAD9B2C254D6F30.101


PRP results:
dateuseridcompidcofactorsres64PRP
2020-08-02T08:36:12ANONYMOUSdory
19658347833995583994646423
FE4F003400E44044no
2020-08-02T09:11:34riccardo ubertiColab_noGPU12
19658347833995583994646423
FE4F003400E44044no


P-1 factor-bounds graph:
B1 = 2579889, B2 = 204655330 (P-1 stage 2)
B1 = 2579889, B2 = 186050300 (P-1 stage 2)
B1 = 2579889, B2 = 103195560 (P-1 stage 2)
B1 = 2579889, B2 = 51597780 (P-1 stage 2)
B1 = 2579889, B2 = 25798890 (P-1 stage 2)
B1 = 2149908, B2 = 21499080 (P-1 stage 2)
B1 = 1791590, B2 = 17915900 (P-1 stage 2)
B1 = 500000, B2 = 39600000 (P-1 stage 2)
B1 = 2579889 (P-1 stage 1)
B1 = 500000, B2 = 33000000 (P-1 stage 2)
B1 = 1492992, B2 = 14929920 (P-1 stage 2)
B1 = 2149908 (P-1 stage 1)
B1 = 500000, B2 = 30000000 (P-1 stage 2)
B1 = 1244160, B2 = 12441600 (P-1 stage 2)
B1 = 1791590 (P-1 stage 1)
B1 = 1492992 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1244160 (P-1 stage 1)
B1 = 1036800 (P-1 stage 1)
B1 = 864000 (P-1 stage 1)
B1 = 720000 (P-1 stage 1)
B1 = 600000 (P-1 stage 1)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-08-27T10:08:27+00:00