is 2 5658557 - 1
has 1703396 decimal digits
takes 0.894 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L75C4A245FCD1015Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2675.251165.6716 %5000010000000.02332.2744 %5.274466.4524 %
Target2662.609965.1515 %3600035000000.05152.1938 %2.661465.9160 %
Difference+1+2.6412+0.5201 %+14000-2500000-0.0282+0.0806%+2.6131+0.5364 %

Known prime factors (1 factor, 62.5 bits, 0.00110486% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
565855766081431081441324411962.519583907090460
22 × 3 × 5 × 9731784841
2009-02-07597317848410.1288121.41226.76

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2023-05-12This -Anonymous-Manual testing5000010000006--0.0262.579%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-09-13ANONYMOUSv4_computers212620.054


ECM factoring results:
Total ECM effort:0.168 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.168


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-10-25ANONYMOUSv4_computers75C4A245FCD1015D0.894
2000-12-31ANONYMOUSv4_computers75C4A245FCD1015D0.894


PRP results:
dateuseridcompidcofactorsres64
2017-09-20kkmrkkblmbrbkManual testing
6608143108144132441
3759A0183EDC218F
2018-07-15BattlemaxxWork-3
6608143108144132441
3759A0183EDC218F


CERT results:
No CERT results for M5658557


P-1 factor-bounds graph:
B1 = 50000, B2 = 1000000 (P-1 stage 2)
B1 = 50000 (P-1 stage 1)
100
101
102
103
104
105
100
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
262
this exponent TF target: 66
TF double-checked to: 67
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00