is 2 1940087 - 1
has 584025 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-LFB5DB52AE381DF62double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26830.722869.1176 %500000002561024165701,101.309820.5745 %1,132.032675.4715 %
Target2620.316766.1290 %80004500000.00251.1518 %0.319266.5192 %
Difference+6+30.4061+2.9886 %+49992000+256101966570+1,101.3072+19.4227%+1,131.7134+8.9524 %

Known prime factors:
No known factors for M1940087

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-10-25kurlyManual testing10000003000000012--0.2039.632%
2018-01-27JossManual testing19400873000000012--0.27310.014%
2018-02-12JossManual testing19400876000000012--0.40111.129%
2018-03-02JossManual testing194008712000000012--0.65912.233%
2018-04-09JossManual testing194008719400870012--0.97612.990%
2022-08-06Wentao HuangBluekid23300009790191180--51.0619.171%
2023-04-25RichD0Linux-5b50000000256102416570--1,33527.685%


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


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-12-27ANONYMOUSv4_computers212580.020
2010-01-29S485122USB-W2602610.079
2011-08-27GrunwalderGIMPManual testing212630.822
2016-02-23Mark RoseManual testing2582630.724
2015-05-06lycornManual testing2632652.938
2015-09-05ramgeisManual testing2652663.852
2017-12-04TJAOIManual testing2662677.704
2019-05-11chuenkitManual testing26726815.41


ECM factoring results:
Total ECM effort:77.068 GHz-days
Estimated T-Level:25.840
DigitsB1CompleteFacMiss
201100015.3040.000%
25500001.86315.527%
302500000.16884.530%
3510000000.01298.762%


ECM Summary

B1B2factorcurvesGHz-days
50000500000020414.08
500006600000473.689
2500002017994044357.46
25000023541903011.847


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-26ANONYMOUSv4_computersFB5DB52AE381DF620.105
2015-06-27MadPooManual testingFB5DB52AE381DF620.105


PRP results:
No PRP results for M1940087


CERT results:
No CERT results for M1940087


P-1 factor-bounds graph:
B1 = 50000000, B2 = 256102416570 (P-1 stage 2)
B1 = 2330000, B2 = 9790191180 (P-1 stage 2)
B1 = 50000000 (P-1 stage 1)
B1 = 1940087, B2 = 194008700 (P-1 stage 2)
B1 = 1940087, B2 = 120000000 (P-1 stage 2)
B1 = 1940087, B2 = 60000000 (P-1 stage 2)
B1 = 1940087, B2 = 30000000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 2330000 (P-1 stage 1)
B1 = 1940087 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
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1010
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TF factor-bounds graph:
268
267
266
265
263
261
258
this exponent TF target: 62
TF double-checked to: 67
ECM T-Level=25.84 ~= 69-bit
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Last modified: 2024-03-13T02:15:48+00:00