is 2 646889 - 1
has 194733 decimal digits
takes 0.010 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LA411CA992C54DD52double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26745.933670.1493 %1000000300000000.05685.5076 %45.990471.7933 %
Target2440.000054.5455 %1100020000000.002615.9494 %0.002661.7952 %
Difference+23+45.9336+15.6038 %+989000+28000000+0.0542-10.4418 %+45.9878+9.9981 %

Known prime factors (1 factor, 90.9 bits, 0.01404879% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
64688922784140005937190314657777992890.8801761054833668310198091
33 × 29 × 430753 × 557377 × 9367717
2013-10-225573779367717613,387,3180.02290.0250

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2000-12-07Alex Kruppav4_computers1000004000000--0.00724.394%
2002-05-11ANONYMOUSv4_computers163841638400--0.00219.947%
2002-07-06ANONYMOUSv4_computers32768327680012--0.00522.649%
2002-10-07ANONYMOUSv4_computers65536655360012--0.00925.302%
2003-06-01ANONYMOUSv4_computers1310721310720012--0.01827.900%
2011-07-10JossManual testing350638350638--0.00816.746%
2011-09-05JossManual testing584397584397--0.01318.324%
2012-06-19JossManual testing646937646937--0.01418.638%
2012-08-11JossManual testing12937781293778--0.02920.770%
2013-10-22David Campeaui5-2500k2890.8800.0770.000%
2016-03-17alpertronManual testing10000003000000012
skipped known factor: 2278414000593719031465777799
---31.611%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-01-19ANONYMOUSv4_computers2532540.002
2022-03-07LordJuliusManual testing254255
2001-04-15ANONYMOUSv4_computers212560.015
2001-12-22ANONYMOUSv4_computers212570.030
2003-10-31ANONYMOUSv4_computers212580.059
2008-10-14Sturle Sundedanzi.ifi2582600.178
2011-01-06Sid & AndyToy_Soldier2602610.237


ECM factoring results:
Total ECM effort:18.636 GHz-days
Estimated T-Level:26.530
DigitsB1CompleteFacMiss
201100024.8080.000%
25500003.1824.149%
302500000.30673.637%
3510000000.02397.679%
4030000000.00299.849%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002814.575
25000025000000443.750
2500004000000010010.31


Lucas-Lehmer results:
No L-L results for M646889


PRP results:
dateuseridcompidcofactorsres64
2017-09-27Oliver KruseGTX-1
2278414000593719031465777799
9FF6D4D5F27BEDD5
2017-09-28Oliver KruseManual testing
2278414000593719031465777799
9FF6D4D5F27BEDD5
2017-11-09kkmrkkblmbrbkc4.large
2278414000593719031465777799
9FF6D4D5F27BEDD5
2020-04-19Oliver KruseAddPrpType5
2278414000593719031465777799
E6B9106744B0790B


CERT results:
No CERT results for M646889


P-1 factor-bounds graph:
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1293778 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 646937 (P-1 stage 1)
B1 = 584397 (P-1 stage 1)
B1 = 65536, B2 = 6553600 (P-1 stage 2)
B1 = 350638 (P-1 stage 1)
B1 = 100000, B2 = 4000000 (P-1 stage 2)
B1 = 32768, B2 = 3276800 (P-1 stage 2)
B1 = 131072 (P-1 stage 1)
B1 = 16384, B2 = 1638400 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 65536 (P-1 stage 1)
B1 = 32768 (P-1 stage 1)
B1 = 16384 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
TF factor-bounds graph:
261
260
258
257
256
255
254
this exponent TF target: 44
TF double-checked to: 67
ECM T-Level=26.53 ~= 72-bit
250
260
270
280
290
2100
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Last modified: 2024-03-13T02:15:48+00:00