is 2 63887627 - 1
has 19232093 decimal digits
takes 150.077 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
Actual27459.884364.8649 %----59.884364.8649 %
Target27459.884364.8649 %4000007000000014.27863.7901 %74.162966.1965 %
Difference----400000-70000000-14.2786-3.7901 %-14.2786-1.3316 %

Known prime factors (1 factor, 88.3 bits, 0.00013815% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
638876273707832958720339211722111372788.2612901839630637978784
25 × 13 × 47 × 593 × 368633 × 678943
2013-11-093686336789431,631,9181.31322.5554

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2013-11-09Craig MeyersManual testing2788.2612.9320.000%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-11-17ANONYMOUSv4_computers212502.30000e-6
2003-08-25Gordon Spencev4_computers212590.001
2022-03-30LordJuliusManual testing21263
2009-03-03Wojciech Florekarmada42632640.031
2009-09-13RomanyukRomanyuk-PC2642650.058
2010-01-02ahbanksmars2652660.117
2010-01-03ahbanksmars2662670.234
2010-01-08HatchHome2672680.468
2010-01-14HatchHome2682690.936
2012-01-04nadineposte42692701.871
2012-11-03Clown_RoyalManual testing2702713.743
2013-08-16TheJudgerManual testing27127322.46
2013-10-20BdotManual testing27327429.94


ECM factoring results:
No ECM results for M63887627


Lucas-Lehmer results:
No L-L results for M63887627


PRP results:
No PRP results for M63887627


CERT results:
No CERT results for M63887627


P-1 factor-bounds graph:
104
105
106
104
105
106
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
290
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Last modified: 2024-03-13T02:15:48+00:00