is 2 56285227 - 1
has 16943542 decimal digits
takes 119.293 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
Actual2718.493963.3803 %----8.493963.3803 %
Target27333.984864.3836 %4000006500000012.04574.0620 %46.030565.8303 %
Difference-2-25.4910-1.0033 %-400000-65000000-12.0457-4.0620 %-37.5366-2.4500 %

Known prime factors (1 factor, 71.8 bits, 0.00012762% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
5628522742035248062984994824312271.83237341279678045
3 × 5 × 72 × 109 × 6221 × 74923
2011-11-2462217492315.6390.03060.0389

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-11-24runnerRunner2271.8321.8130.000%


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-12-15ANONYMOUSv4_computers212532.13000e-5
2000-03-08ANONYMOUSv4_computers212544.26000e-5
2000-06-11ANONYMOUSv4_computers212560.000
2001-09-22ANONYMOUSv4_computers212570.000
2002-09-22ANONYMOUSv4_computers212580.001
2022-06-27LordJuliusManual testing21263
2008-07-12Sturle Sundezumthor.ifi2632640.033
2008-07-13Sturle Sundefungo.ifi2642650.066
2008-07-13Sturle Sundevancraft.ifi2652660.133
2008-07-13Sturle Sundeinteravia.ifi2662670.266
2009-05-20Sturle Sundegiasha.ifi2672680.531
2011-04-17David Barleyscrappy2682691.062
2011-06-03ANONYMOUSSlavanator2692702.124
2011-08-24NBBlackBird2702714.249


ECM factoring results:
No ECM results for M56285227


Lucas-Lehmer results:
No L-L results for M56285227


PRP results:
No PRP results for M56285227


CERT results:
No CERT results for M56285227


P-1 factor-bounds graph:
102
103
104
102
103
104
105
TF factor-bounds graph:
271
270
269
268
267
266
265
264
263
258
257
256
254
253
this exponent TF target: 73
TF double-checked to: 67
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00