is 2 1989101 - 1
has 598780 decimal digits
takes 0.131 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF3731550B73CB5DBdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26829.965769.1176%19891012486376251.47088.4951%31.436571.7411%2.6235%
PrimeNet2580.019363.7931%80001400000.00142.4762%0.020864.6897%0.8966%
GPU722620.308966.1290%80001000000.00121.1984%0.310166.5349%0.4059%
Difference+6+29.6569+2.9886%+1981101+248537625+1.4695+7.2967%+31.1264+5.2062%+5.2062%

Known prime factors (1 factor, 84.2 bits, 0.00423260% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1989101220775757473791766535905512684.1915549636681943042775
52 × 43 × 59 × 87499198769303
2020-04-2259874991987693033,220,961454,493848,866

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-01-28T14:21:00kurlyhex100000030000000---0.246--5.709%
2018-01-28T11:49:25Jocelyn Larouchelow 4M19891013000000012---0.335--6.071%
2018-02-15T13:14:31Jocelyn Larouchelow 4M19891016000000012---0.491--6.858%
2018-03-10T11:04:13Jocelyn Larouchelow 4M198910112000000012---0.803--7.653%
2018-05-21T11:06:47Jocelyn Larouchelow 4M198910119891010012---1.212--8.237%
2018-11-26T12:53:50Jocelyn LaroucheManual testing198910124863762512---1.471--8.495%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-27T00:00:00ANONYMOUSv4_computers21258--0.019--
2016-02-23T16:29:02Mark RoseManual testing258260--0.058--
2009-12-13T05:00:00S485122USB-W260261--0.077--
2016-02-23T16:29:02Mark RoseManual testing261262--0.154--
2011-08-27T22:55:00GrunwalderGIMPManual testing21263--0.802--
2016-02-23T16:29:02Mark RoseManual testing262263--0.494--
2015-03-08T20:45:00lycornManual testing263264--0.987--
2015-03-08T20:45:00lycornManual testing264265--1.878--
2015-09-12T12:52:00ramgeisManual testing265266--3.757--
2017-09-22T15:53:14TJAOIManual testing266267--7.514--
2019-05-19T04:32:14chuenkitManual testing267268--15.03--


ECM factoring results:

Old Calculation Method

Total ECM effort:8.284 GHz-days
Estimated T-Level:4.900
DigitsB1CurvesCompleteFacMiss
201100098 / 1000.98037.346%
255000098 / 2800.35070.425%

New Calculation Method

Total ECM effort:8.284 GHz-days
Estimated T-Level:4.900
DigitsB1CompleteFacMiss
20110003.1614.237%
25500000.28675.148%
302500000.01898.256%


ECM Summary

B1B2factorcurvesGHz-days
500005000000968.115
50000500000020.169


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10T00:00:00ANONYMOUSv4_computersF3731550B73CB5DB0.131
2016-06-02T10:53:05MadPooManual testingF3731550B73CB5DB0.131


PRP results:
dateuseridcompidcofactorsres64PRP
2020-04-22T08:14:36CrypticCluecruncher
22077575747379176653590551
58CD33F403883E50no
2020-04-22T11:05:25Igvan28MineOld
22077575747379176653590551
58CD33F403883E50no


P-1 factor-bounds graph:
B1 = 1989101, B2 = 248637625 (P-1 stage 2)
B1 = 1989101, B2 = 198910100 (P-1 stage 2)
B1 = 1989101, B2 = 120000000 (P-1 stage 2)
B1 = 1989101, B2 = 60000000 (P-1 stage 2)
B1 = 1989101, B2 = 30000000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1989101 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-04-22T11:05:25+00:00