is 2 63473251 - 1
has 19107353 decimal digits
takes 149.103 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
Actual27460.275264.8649 %----60.275264.8649 %
Target27460.275264.8649 %4000007000000014.27863.7870 %74.553966.1954 %
Difference----400000-70000000-14.2786-3.7870 %-14.2786-1.3306 %

Known prime factors (1 factor, 76.7 bits, 0.00012085% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
634732511232240760819330888762972476.706970677207647148
22 × 3 × 19 × 47 × 521 × 3079 × 56467
2013-09-09307956467365.740.02040.0213

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2013-09-09Richard KintXPS2476.7061.8730.000%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-11-17ANONYMOUSv4_computers212502.40000e-6
2003-07-30Gordon Spencev4_computers212590.001
2022-03-30LordJuliusManual testing21263
2009-02-23Wojciech Florekarmada42632640.031
2009-02-26ANONYMOUShollatime2642650.059
2009-03-02BranMuffinAventerra-O32652660.118
2009-03-04BranMuffinAventerra-O32662670.235
2009-03-07BranMuffinAventerra-O32672680.471
2009-08-25subgeniusHDO-c12682690.942
2011-12-25GrunwalderGIMPLyc-i72692701.884
2012-09-09Bold_SeekerManual testing2702713.767
2013-06-01TheJudgerManual testing27127322.60
2013-09-01HobelixManual testing27327430.14


ECM factoring results:
No ECM results for M63473251


Lucas-Lehmer results:
No L-L results for M63473251


PRP results:
No PRP results for M63473251


CERT results:
No CERT results for M63473251


P-1 factor-bounds graph:
102
103
104
102
103
104
105
TF factor-bounds graph:
274
273
271
270
269
268
267
266
265
264
263
259
250
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