is 2 212485381 - 1
has 63964474 decimal digits
takes 1,866.625 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
Actual27536.011562.6667 %----36.011562.6667 %
Target279576.195864.5570 %1300000250000000189.15534.0310 %765.351165.9857 %
Difference-4-540.1844-1.8903 %-1300000-250000000-189.1553-4.0310 %-729.3397-3.3190 %

Known prime factors (1 factor, 75.5 bits, 0.00003551% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
212485381516603143177138335702972375.451121562043644108
22 × 23 × 3467 × 8669 × 43963
2020-12-1386694396368.3450.13490.2247

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2020-12-13Markus TervoorenManual testing2375.45110.890.000%


Trial Factoring results:
5758596061626364656667686970717273747576777879
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2011-05-21HBendtzHAL90062642650.018
2013-08-21Richardhp-yulian2652660.035
2015-10-16ANONYMOUSdhzja32662670.070
2016-08-22XZTManual testing2672680.141
2017-11-24Dave Bellmars2682690.281
2019-02-08Niels_Mache_NextcloudManual testing2692700.563
2020-01-07Chabot PrimeCC3906-602702711.125
2020-06-12SRBaseManual testing2712722.251
2020-10-25SRBaseManual testing2722734.502
2020-12-13Markus TervoorenManual testing273274
2020-12-13Markus TervoorenManual testing274275


ECM factoring results:
No ECM results for M212485381


Lucas-Lehmer results:
No L-L results for M212485381


PRP results:
No PRP results for M212485381


CERT results:
No CERT results for M212485381


P-1 factor-bounds graph:
102
103
104
102
103
104
105
TF factor-bounds graph:
275
274
273
272
271
270
269
268
267
266
265
this exponent TF target: 79
TF double-checked to: 67
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00