is 2 1861157 - 1
has 560265 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-L4817EA73E64625C4double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.965368.6567%2579889928760040.58998.1127%16.555271.1995%2.5428%
PrimeNet2570.010363.1579%90001600000.00143.0265%0.011764.2729%1.1150%
GPU722610.165065.5738%90001500000.00131.6330%0.166466.1359%0.5622%
Difference+6+15.8002+3.0829%+2570889+92726004+0.5886+6.4797%+16.3889+5.0636%+5.0636%

Known prime factors (1 factor, 80.9 bits, 0.00434913% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
186115723260423228708066418467512580.944624891484939423875
3 × 53 × 1666377293171797
2018-02-231251666377293171797193,5067,141,67613,338,663

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-05T12:50:00markrtiny2750006000000---0.046--3.925%
2015-10-07T03:08:52Bruno Victal5820K-linux5000001500000012---0.101--5.079%
2016-09-14T01:57:19Jocelyn Larouchelow 4M5000003000000012---0.166--5.742%
2016-09-30T05:55:09Jocelyn Larouchelow 4M500000330000006---0.179--5.834%
2016-10-07T05:52:37Jocelyn Larouchelow 4M500000396000006---0.207--6.012%
2016-10-29T20:53:45Jocelyn Larouchelow 4M600000600000---0.047--2.158%
2016-12-19T18:36:36Jocelyn Larouchelow 4M720000720000---0.057--2.323%
2016-12-29T21:51:16Jocelyn Larouchelow 4M864000864000---0.068--2.495%
2017-01-14T05:24:36Jocelyn Larouchelow 4M10368001036800---0.082--2.674%
2017-02-12T18:28:06Jocelyn Larouchelow 4M12441601244160012---0.146--5.353%
2017-03-25T20:16:12Jocelyn Larouchelow 4M14929921492992012---0.175--5.632%
2017-03-29T03:10:19Jocelyn Larouchelow 4M17915901791590012---0.210--5.918%
2017-05-22T21:10:26Jocelyn Larouchelow 4M21499082149908012---0.252--6.210%
2017-06-14T03:17:00Jocelyn Larouchelow 4M25798894643800212---0.391--7.243%
2018-02-23T13:04:51Jocelyn Larouchelow 4M25798899287600412---0.590--8.113%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:55Mark RoseManual testing258260--0.062--
2010-04-06T12:16:00Architects 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--0.527--
2015-05-07T05:08:00snme2pm1Manual testing263264--1.055--
2015-05-07T05:08:00snme2pm1Manual testing264265--2.008--
2015-09-10T08:47:00ramgeisManual testing265266--4.015--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.137 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.137 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.5420.020%
25500000.77446.131%
302500000.04895.328%
3510000000.00299.780%


ECM Summary

B1B2factorcurvesGHz-days
500005000000483.322
50000500000030.208
50000660000020015.61


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27T00:00:00ANONYMOUSv4_computers4817EA73E64625C40.101
2015-06-27T00:57:00MadPooManual testing4817EA73E64625C40.101


PRP results:
dateuseridcompidcofactorsres64PRP
2018-02-25T23:16:26Oliver KruseGTX-7
2326042322870806641846751
7678D262AF9400__no
2018-02-26T11:15:10kkmrkkblmbrbkc5.xlarge
2326042322870806641846751
7678D262AF9400__no
2018-03-07T13:54:29AdolfNorManual testing
2326042322870806641846751
7678D262AF9400__no


P-1 factor-bounds graph:
B1 = 2579889, B2 = 92876004 (P-1 stage 2)
B1 = 2579889, B2 = 46438002 (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: 2021-08-20T12:35:49+00:00