is 2 1939837 - 1
has 583950 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-LBF9380B9CFBBF800double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26830.726769.1176 %520000002664176615101,145.667120.6678 %1,176.393875.5004 %
Target2620.316766.1290 %80004500000.00251.1518 %0.319266.5192 %
Difference+6+30.4100+2.9886 %+51992000+266417211510+1,145.6646+19.5160%+1,176.0746+8.9812 %

Known prime factors:
No known factors for M1939837

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2012-01-28markrtiny275000600000012--0.0466.542%
2015-10-08Bruno Victal5820K.ECM5000001500000012--0.1018.157%
2016-12-15JossManual testing568903568903---3.720%
2016-12-17JossManual testing682683682683---3.963%
2016-12-24JossManual testing819219819219---4.215%
2017-01-04JossManual testing983062983062---4.474%
2017-01-22JossManual testing11796741179674---4.740%
2017-04-12JossManual testing14156081415608012--0.1668.670%
2018-02-04JossManual testing19398372831216012--0.2669.920%
2018-02-04mikrS067800000032000000012--1.96614.767%
2023-01-11JossManual testing19408371680841890--8.90616.317%
2023-05-28RichD0Linux-5b52000000266417661510--1,38927.787%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2022-08-15masserManual testing15000005400000027--0.400


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-12-21ANONYMOUSv4_computers212580.020
2016-02-23Mark RoseManual testing2582600.059
2010-01-29S485122USB-W2602610.079
2016-02-23Mark RoseManual testing2612620.158
2011-08-27GrunwalderGIMPManual testing212630.823
2016-02-23Mark RoseManual testing2622630.506
2015-05-07lycornManual testing2632641.012
2015-05-07lycornManual testing2642651.926
2015-09-05ramgeisManual testing2652663.852
2017-12-04TJAOIManual testing2662677.705
2019-05-10chuenkitManual testing26726815.41


ECM factoring results:
Total ECM effort:19.834 GHz-days
Estimated T-Level:24.658
DigitsB1CompleteFacMiss
20110009.9100.005%
25500000.93239.394%
302500000.06094.170%
3510000000.00399.709%


ECM Summary

B1B2factorcurvesGHz-days
50000500000019713.59
50000675000070.555
500007500000463.842
25000023541903011.847


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10ANONYMOUSv4_computersBF9380B9CFBBF8000.105
2015-07-01MadPooManual testingBF9380B9CFBBF8000.105


PRP results:
No PRP results for M1939837


CERT results:
No CERT results for M1939837


P-1 factor-bounds graph:
B1 = 52000000, B2 = 266417661510 (P-1 stage 2)
B1 = 1940837, B2 = 1680841890 (P-1 stage 2)
B1 = 52000000 (P-1 stage 1)
B1 = 8000000, B2 = 320000000 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 1939837, B2 = 28312160 (P-1 stage 2)
B1 = 1415608, B2 = 14156080 (P-1 stage 2)
B1 = 1940837 (P-1 stage 1)
B1 = 1939837 (P-1 stage 1)
B1 = 1415608 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1179674 (P-1 stage 1)
B1 = 983062 (P-1 stage 1)
B1 = 819219 (P-1 stage 1)
B1 = 682683 (P-1 stage 1)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 568903 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
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1010
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TF factor-bounds graph:
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267
266
265
264
263
262
261
260
258
this exponent TF target: 62
TF double-checked to: 67
ECM T-Level=24.66 ~= 65-bit
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Last modified: 2024-03-13T02:15:48+00:00