is 2 1987693 - 1
has 598356 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-L05ABF53CE7D2C30Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26714.948968.6567 %1320001343815200.70995.8717 %15.658970.4971 %
Target2620.309166.1290 %80005000000.00331.1982 %0.312466.5349 %
Difference+5+14.6399+2.5277 %+124000+133881520+0.7066+4.6735%+15.3465+3.9622 %

Known prime factors (1 factor, 83.7 bits, 0.00421244% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1987693160449165287807569468063612683.7304036065058532871260
22 × 5 × 13 × 31 × 199 × 401 × 26189 × 239611
2011-01-28261892396111,488,9630.00360.0051

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-01-28kurlyhex2683.7300.0950.000%
2022-08-14USAFSS6917th_Scty_Sq132000134381520
skipped known factor: 16044916528780756946806361
--0.7109.546%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-12-27S00030v4_computers212580.019
2022-03-09LordJuliusManual testing21260
2009-12-14S485122USB-W2602610.077


ECM factoring results:
Total ECM effort:26.227 GHz-days
Estimated T-Level:25.337
DigitsB1CompleteFacMiss
201100011.2050.001%
25500001.05834.715%
302500000.06793.476%
3510000000.00399.683%


ECM Summary

B1B2factorcurvesGHz-days
50000480000070.506
500005000000201.403
50000675000070.587
50000690095570.593
50000697673070.596
50000707775370.600
50000750000021621.94


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02S00030v4_computers05ABF53CE7D2C30E0.131


PRP results:
dateuseridcompidcofactorsres64
2017-10-05Oliver KruseGTX-0
16044916528780756946806361
C6B5D2B88C6B519E
2017-11-12Chang Chia-Tcheex01
16044916528780756946806361
C6B5D2B88C6B519E


CERT results:
No CERT results for M1987693


P-1 factor-bounds graph:
B1 = 132000, B2 = 134381520 (P-1 stage 2)
B1 = 132000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
109
TF factor-bounds graph:
261
260
258
this exponent TF target: 62
TF double-checked to: 67
ECM T-Level=25.34 ~= 68-bit
250
260
270
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290
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Last modified: 2024-03-13T02:15:48+00:00