is 2 62421661 - 1
has 18790793 decimal digits
takes 146.633 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27330.643964.3836 %----30.643964.3836 %
Target27461.290764.8649 %4000006500000013.35073.7250 %74.641466.1736 %
Difference-1-30.6468-0.4813 %-400000-65000000-13.3507-3.7250 %-43.9975-1.7901 %

Known prime factors (1 factor, 79.0 bits, 0.00012660% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
624216616141982379680504196768092479.0234919752439526164
22 × 6451 × 37489 × 5085719
2013-04-023748950857193,763.21.06451.7627

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2013-04-02apocalypsecapn-quad2479.0234.3160.000%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-07-06Gordon Spencev4_computers212590.001
2022-03-30LordJuliusManual testing21263
2008-12-20DerekDerek_Desk2632640.031
2009-08-18sannerud.comsnap12642650.060
2009-08-20Sturle Sundefungo.ifi2652660.120
2009-08-24Gordon BowerPAIR2662670.239
2009-08-24Emma T Katbullwinkle2672680.479
2009-10-22trifdrake2682690.958
2011-12-04S00030vd102692701.915
2012-09-04Bold_SeekerManual testing2702713.831
2013-03-17GrunwalderGIMPManual testing27127322.99


ECM factoring results:
No ECM results for M62421661


Lucas-Lehmer results:
No L-L results for M62421661


PRP results:
No PRP results for M62421661


CERT results:
No CERT results for M62421661


P-1 factor-bounds graph:
103
104
105
103
104
105
106
107
TF factor-bounds graph:
273
271
270
269
268
267
266
265
264
263
259
this exponent TF target: 74
TF double-checked to: 67
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00