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
factored, 0 LL tests remaining
ResidueStatus
L-LF3731550B73CB5DBdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26829.965769.1176 %19891012486376251.47088.4951 %31.436571.7411 %
Target2620.308966.1290 %80005000000.00331.1984 %0.312266.5349 %
Difference+6+29.6569+2.9886 %+1981101+248137625+1.4675+7.2967%+31.1243+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
2020-04-2259874991987693031,969,668454,493848,866

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-01-28kurlyhex10000003000000012--0.2469.656%
2018-01-28JossManual testing19891013000000012--0.33510.050%
2018-02-15JossManual testing19891016000000012--0.49111.170%
2018-03-10JossManual testing198910112000000012--0.80312.277%
2018-05-21JossManual testing198910119891010012--1.21213.077%
2018-11-26JossManual testing198910124863762512--1.47113.428%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-12-27ANONYMOUSv4_computers212580.019
2016-02-23Mark RoseManual testing2582600.058
2009-12-13S485122USB-W2602610.077
2016-02-23Mark RoseManual testing2612620.154
2011-08-27GrunwalderGIMPManual testing212630.802
2016-02-23Mark RoseManual testing2622630.494
2015-03-08lycornManual testing2632640.987
2015-03-08lycornManual testing2642651.878
2015-09-12ramgeisManual testing2652663.757
2017-09-22TJAOIManual testing2662677.514
2019-05-19chuenkitManual testing26726815.03


ECM factoring results:
Total ECM effort:22.915 GHz-days
Estimated T-Level:24.767
DigitsB1CompleteFacMiss
201100010.1440.004%
25500000.95338.539%
302500000.06194.119%
3510000000.00399.716%


ECM Summary

B1B2factorcurvesGHz-days
500005000000967.224
50000500000020.147
50000750000015315.54


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


PRP results:
dateuseridcompidcofactorsres64
2020-04-22M Millercruncher
22077575747379176653590551
58CD33F403883E50
2020-04-22Igvan28MineOld
22077575747379176653590551
58CD33F403883E50


CERT results:
No CERT results for M1989101


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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this exponent TF target: 62
TF double-checked to: 67
ECM T-Level=24.77 ~= 66-bit
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Last modified: 2024-02-29T14:28:04+00:00