is 2 55621697 - 1
has 16743800 decimal digits
takes 117.887 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
Actual27217.193563.8889 %----17.193563.8889 %
Target27334.390364.3836 %3600006000000011.09223.9357 %45.482565.7853 %
Difference-1-17.1967-0.4947 %-360000-60000000-11.0922-3.9357 %-28.2890-1.8964 %

Known prime factors (1 factor, 81.1 bits, 0.00014579% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
5562169725751270846425643208796572581.09123148584307330324
22 × 3 × 29 × 2087 × 36527 × 872587
2012-07-153652787258715,2540.25220.2729

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2012-07-15Kevin JagetWorkstation2581.0913.5550.000%


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-12-15ANONYMOUSv4_computers212532.16000e-5
2000-03-01ANONYMOUSv4_computers212544.31000e-5
2000-05-31ANONYMOUSv4_computers212560.000
2001-09-30ANONYMOUSv4_computers212570.000
2002-08-03ANONYMOUSv4_computers212580.001
2006-08-25BJBv4_computers212620.006
2008-08-18ANONYMOUSManual testing212640.034
2009-01-06snake918desk2642650.067
2009-01-10snake918desk2652660.134
2009-01-13snake918desk2662670.269
2009-05-18Mike Curtiszz42672680.537
2011-04-12Jens PedersenDumbass2682691.075
2011-06-04Per Jessenbeaufort12692702.150
2012-03-27Kevin JagetManual testing2702714.299
2012-05-08Craig MeyersManual testing2712728.598


ECM factoring results:
No ECM results for M55621697


Lucas-Lehmer results:
No L-L results for M55621697


PRP results:
No PRP results for M55621697


CERT results:
No CERT results for M55621697


P-1 factor-bounds graph:
103
104
105
103
104
105
106
TF factor-bounds graph:
272
271
270
269
268
267
266
265
264
262
258
257
256
254
253
this exponent TF target: 73
TF double-checked to: 67
250
260
270
280
290
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Last modified: 2024-03-13T02:15:48+00:00