is 2 55493563 - 1
has 16705228 decimal digits
takes 117.616 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LD1514673EFC07778double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27334.469764.3836 %1000000200000006.25454.9023 %40.724166.1296 %
Target27334.469764.3836 %3600006000000011.09223.9345 %45.561965.7849 %
Difference---+640000-40000000-4.8378+0.9678%-4.8378+0.3447 %

Known prime factors (1 factor, 137.8 bits, 0.00024831% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
5549356330277055170963696727959643123753939326636942137.7972727979024428805979529521570254368
25 × 3 × 7 × 29 × 503 × 47711 × 99787 × 152219 × 170279 × 2255191
2018-02-0117027922551912.355e+90.87241.0650

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2012-04-11ANONYMOUS680000680000--2.0901.883%
2018-02-01Sid & AndySpeck1000000200000006242137.7976.2544.902%


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-12-15ANONYMOUSv4_computers212532.16000e-5
2000-03-01ANONYMOUSv4_computers212544.32000e-5
2000-05-31ANONYMOUSv4_computers212560.000
2001-09-30ANONYMOUSv4_computers212570.000
2002-07-27ANONYMOUSv4_computers212580.001
2016-02-23Mark RoseManual testing2582630.034
2009-01-131997rj7compw2632640.035
2009-01-14tmorrowteapot2642660.202
2009-01-16tmorrowteapot2662670.269
2009-05-23RoaldSmXP972672680.539
2011-04-10ITSSP-Koko2682691.077
2011-06-09Chris VernieriGASFLO2692702.155
2012-04-05lycornManual testing27027212.93
2016-01-29ANONYMOUSManual testing27227317.24


ECM factoring results:
No ECM results for M55493563


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2013-02-02ANONYMOUSD1514673EFC07778117.6


PRP results:
No PRP results for M55493563


CERT results:
No CERT results for M55493563


P-1 factor-bounds graph:
B1 = 1000000, B2 = 20000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 680000 (P-1 stage 1)
104
105
106
104
105
106
107
108
TF factor-bounds graph:
273
272
270
269
268
267
266
264
263
258
257
256
254
253
this exponent TF target: 73
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00