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M63 918 553 Mersenne number exponent details
is 2 63918553 - 1
has 19241402 decimal digits
takes 150.149 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
Actual27214.961863.8889 %----14.961863.8889 %
Target27459.855364.8649 %4000007000000014.27863.7903 %74.133966.1966 %
Difference-2-44.8936-0.9760 %-400000-70000000-14.2786-3.7903 %-59.1722-2.3077 %

Known prime factors (1 factor, 72.9 bits, 0.00011402% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
6391855386952804372812467069672272.88168018439319811
8191 × 8304045821
2013-08-128191830404582120.6331,541.12,878.2

P-1 results:
No P-1 results for M63918553


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-11-17ANONYMOUSv4_computers212502.30000e-6
2003-08-25Gordon Spencev4_computers212590.001
2022-03-30LordJuliusManual testing21263
2009-02-21Wojciech Florekarmada42632640.031
2009-09-11Sturle Sundedanzi.ifi2642650.058
2009-11-11GrunwalderGIMPcompute-0-12652660.117
2009-11-16ASTERIASRoo2662670.234
2009-11-26Ungelovendei7_12672680.468
2009-11-28Sturle Sundegibus.ifi2682690.935
2012-01-16Dave Rutherfordmongo2692701.871
2012-10-02ANONYMOUS2702713.741
2013-08-12Bill StaffenManual testing271273
72.881
22
10.41


ECM factoring results:
No ECM results for M63918553


Lucas-Lehmer results:
No L-L results for M63918553


PRP results:
No PRP results for M63918553


CERT results:
No CERT results for M63918553


P-1 factor-bounds graph:
102
103
104
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
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