is 2 1927097 - 1
has 580115 decimal digits
takes 0.105 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LAD289B8C39E97876double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26830.929969.1176%21499081927097000.98588.2330%31.915771.6602%2.5426%
PrimeNet2570.010063.1579%90001700000.00143.0949%0.011464.2981%1.1402%
GPU722610.159465.5738%110001700000.00151.8143%0.160966.1984%0.6246%
Difference+7+30.7705+3.5439%+2138908+192539700+0.9843+6.4188%+31.7547+5.4618%+5.4618%

Known prime factors (1 factor, 78.3 bits, 0.00406411% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19270973771119999896488109275432478.31997844581769793843
3 × 233 × 389 × 359840469013
2020-03-0238935984046901356,5401,542.22,880.4

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-06-21T00:00:00ANONYMOUSv4_computers3000009000000---0.061--3.910%
2015-10-08T06:46:02Bruno Victal5820K-linux5000001500000012---0.101--4.629%
2016-08-31T02:35:06Jocelyn Larouchelow4M6000003000000012---0.173--5.368%
2016-09-30T05:55:07Jocelyn Larouchelow 4M600000330000006---0.186--5.456%
2017-01-03T05:50:43Jocelyn Larouchelow 4M864000864000---0.068--2.245%
2017-01-21T06:59:41Jocelyn Larouchelow 4M10368001036800---0.082--2.410%
2017-06-27T02:15:39Jocelyn Larouchelow 4M12441602239488012---0.189--5.507%
2017-07-18T02:33:41Jocelyn Larouchelow 4M14929921492992012---0.175--5.162%
2017-07-30T02:46:01Jocelyn Larouchelow 4M17915901791590012---0.210--5.432%
2017-08-04T01:13:07Jocelyn Larouchelow 4M21499082149908012---0.252--5.707%
2018-02-09T03:27:10Jocelyn Larouchelow 4M21499084299816012---0.344--6.498%
2018-02-23T13:04:47Jocelyn Larouchelow 4M21499088599632012---0.528--7.296%
2018-06-19T11:36:53Jocelyn Larouchelow 4M214990819270970012---0.986--8.233%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-21T00:00:00ANONYMOUSv4_computers21257--0.010--
2002-12-16T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:58Mark RoseManual testing258260--0.060--
2010-02-09T22:26:00S485122USB-W260261--0.080--
2016-02-23T16:28:58Mark RoseManual testing261262--0.159--
2011-08-27T22:55:00GrunwalderGIMPManual testing21263--0.828--
2016-02-23T16:28:58Mark RoseManual testing262263--0.509--
2015-05-17T21:09:00snme2pm1Manual testing263264--1.019--
2015-05-17T21:09:00snme2pm1Manual testing264265--1.939--
2015-09-03T11:06:00ramgeisManual testing265266--3.878--
2018-04-02T12:17:06TJAOIManual testing266267--7.755--
2019-05-04T04:32:14chuenkitManual testing267268--15.51--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.868 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:18.868 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.4530.021%
25500000.76546.519%
302500000.04795.381%
3510000000.00299.783%


ECM Summary

B1B2factorcurvesGHz-days
500005000000906.253
50000500000010.069
50000660000016012.55


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-26T00:00:00bezaharv4_computersAD289B8C39E978760.105
2015-07-14T15:04:00MadPooManual testingAD289B8C39E978760.105


PRP results:
dateuseridcompidcofactorsres64PRP
2020-03-02T20:24:12Xyzzyi7-9700K
377111999989648810927543
F2F0FA8F4DDF3A50no
2020-03-04T02:19:56Luigi Morelli9800X
377111999989648810927543
F2F0FA8F4DDF3A50no


P-1 factor-bounds graph:
B1 = 2149908, B2 = 192709700 (P-1 stage 2)
B1 = 2149908, B2 = 85996320 (P-1 stage 2)
B1 = 2149908, B2 = 42998160 (P-1 stage 2)
B1 = 2149908, B2 = 21499080 (P-1 stage 2)
B1 = 1791590, B2 = 17915900 (P-1 stage 2)
B1 = 1244160, B2 = 22394880 (P-1 stage 2)
B1 = 600000, B2 = 33000000 (P-1 stage 2)
B1 = 1492992, B2 = 14929920 (P-1 stage 2)
B1 = 600000, B2 = 30000000 (P-1 stage 2)
B1 = 2149908 (P-1 stage 1)
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 = 300000, B2 = 9000000 (P-1 stage 2)
B1 = 600000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 300000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-02-10T10:47:57+00:00