is 2 1887451 - 1
has 568180 decimal digits
takes 0.102 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6C06A90A70EEEC31double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26831.579669.1176%30958661887451001.03928.4521%32.618771.7278%2.6102%
PrimeNet2570.010263.1579%90001600000.00143.0343%0.011564.2758%1.1179%
GPU722610.162765.5738%100001500000.00141.6928%0.164166.1565%0.5828%
Difference+7+31.4168+3.5439%+3085866+188595100+1.0378+6.7593%+32.4546+5.5713%+5.5713%

Known prime factors (1 factor, 81.0 bits, 0.00428886% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
188745123358488423509604009970792580.950618783969054285489
3 × 7 × 13 × 49711 × 45595702063
2020-07-224971145595702063146,835195.42364.97

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-18T01:00:00markrtiny2750006000000---0.046--3.541%
2015-10-07T20:51:34Bruno Victal5820K-linux5000001500000012---0.101--4.617%
2016-09-22T11:43:16Jocelyn Larouchelow 4M5000001650000012---0.108--4.701%
2016-10-07T05:52:33Jocelyn Larouchelow 4M500000198000006---0.122--4.861%
2016-10-10T15:05:07Jocelyn Larouchelow 4M5000005000000012---0.251--5.692%
2016-11-03T20:53:43Jocelyn Larouchelow 4M600000600000---0.047--1.927%
2016-12-24T02:11:48Jocelyn Larouchelow 4M720000720000---0.057--2.079%
2016-12-29T21:51:13Jocelyn Larouchelow 4M864000864000---0.068--2.238%
2017-01-21T06:59:37Jocelyn Larouchelow 4M10368001036800---0.082--2.403%
2017-03-01T23:52:31Jocelyn Larouchelow 4M12441601244160012---0.146--4.887%
2017-06-19T04:39:21Jocelyn Larouchelow 4M14929922687385612---0.226--5.778%
2017-07-18T02:33:41Jocelyn Larouchelow 4M17915901791590012---0.210--5.419%
2017-07-30T02:46:00Jocelyn Larouchelow 4M21499082149908012---0.252--5.694%
2017-08-04T01:13:06Jocelyn Larouchelow 4M25798892579889012---0.302--5.976%
2017-08-11T00:31:28Jocelyn Larouchelow 4M30958663095866012---0.363--6.263%
2018-02-16T12:53:16Jocelyn Larouchelow 4M30958666191732012---0.496--7.099%
2018-03-14T11:52:42Jocelyn Larouchelow 4M309586612383464012---0.761--7.939%
2018-05-02T11:49:43Jocelyn Larouchelow 4M309586618874510012---1.039--8.452%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:56Mark RoseManual testing258260--0.061--
2010-04-02T14:24:00Architects CubedManual testing260261--0.081--
2016-02-23T16:28:57Mark RoseManual testing261262--0.163--
2011-03-08T05:15:00GrunwalderGIMPManual testing21263--0.846--
2016-02-23T16:28:56Mark RoseManual testing262263--0.520--
2015-05-10T08:11:00snme2pm1Manual testing263264--1.040--
2015-05-10T08:11:00snme2pm1Manual testing264265--1.980--
2015-09-13T19:11:00ramgeisManual testing265266--3.959--
2018-05-07T13:42:44TJAOIManual testing266267--7.918--
2019-06-17T12:14:56TJAOIManual testing267268--15.84--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.373 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:18.373 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.3410.024%
25500000.75547.009%
302500000.04795.447%
3510000000.00299.786%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001389.57
50000500000030.208
5000066000001108.600


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-09-22T00:00:00ANONYMOUSv4_computers6C06A90A70EEEC310.102
2015-07-06T20:15:00MadPooManual testing6C06A90A70EEEC310.102


PRP results:
dateuseridcompidcofactorsres64PRP
2020-07-22T11:56:52CrypticCluecruncher
2335848842350960400997079
E2C6DE711535F43Ano
2020-07-23T10:58:58marssystemssystem11
2335848842350960400997079
E2C6DE711535F43Ano


P-1 factor-bounds graph:
B1 = 3095866, B2 = 188745100 (P-1 stage 2)
B1 = 3095866, B2 = 123834640 (P-1 stage 2)
B1 = 3095866, B2 = 61917320 (P-1 stage 2)
B1 = 3095866, B2 = 30958660 (P-1 stage 2)
B1 = 2579889, B2 = 25798890 (P-1 stage 2)
B1 = 2149908, B2 = 21499080 (P-1 stage 2)
B1 = 500000, B2 = 50000000 (P-1 stage 2)
B1 = 3095866 (P-1 stage 1)
B1 = 1492992, B2 = 26873856 (P-1 stage 2)
B1 = 1791590, B2 = 17915900 (P-1 stage 2)
B1 = 2579889 (P-1 stage 1)
B1 = 2149908 (P-1 stage 1)
B1 = 1244160, B2 = 12441600 (P-1 stage 2)
B1 = 1791590 (P-1 stage 1)
B1 = 500000, B2 = 19800000 (P-1 stage 2)
B1 = 1492992 (P-1 stage 1)
B1 = 500000, B2 = 16500000 (P-1 stage 2)
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: 2021-10-28T13:39:55+00:00