is 2 106257521 - 1
has 31986702 decimal digits
takes 435.803 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
Actual276144.027464.4737 %7740002296800011.79413.9896 %155.821565.8910 %
Target276144.027464.4737 %70000012000000042.81733.9714 %186.844765.8846 %
Difference---+74000-97032000-31.0232+0.0182%-31.0232+0.0065 %

Known prime factors (1 factor, 89.1 bits, 0.00008384% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1062575216557670570584391481408606312789.0833085744194325967515
5 × 11 × 337 × 10091 × 11273 × 1463503
2021-09-211127314635031,179,8860.53760.8857

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2021-09-21MarkSdesktop-i777400022968000622789.08311.793.990%


Trial Factoring results:
5758596061626364656667686970717273747576
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-04-26Torchwood InstituteInspiron152632640.018
2010-09-04sasaki3USB012642650.035
2012-05-16omiXorpLLB03-z800-182652660.070
2014-11-12g0bManual testing2662670.141
2014-11-15giorgiocolico2672680.281
2015-03-19SMoffatManual testing2682690.563
2015-03-25tmorrowpaperclip2692701.125
2015-04-01tmorrowpaperclip2702712.250
2019-01-25Niels_Mache_NextcloudManual testing2712724.501
2020-03-30SRBaseManual testing2722739.002
2020-05-06CassessoryGPU72_TF27327418.00
2021-04-08TheJudgerManual testing27427536.01
2021-04-08TheJudgerManual testing27527672.01


ECM factoring results:
No ECM results for M106257521


Lucas-Lehmer results:
No L-L results for M106257521


PRP results:
No PRP results for M106257521


CERT results:
No CERT results for M106257521


P-1 factor-bounds graph:
B1 = 774000, B2 = 22968000 (P-1 stage 2)
B1 = 774000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
TF factor-bounds graph:
276
275
274
273
272
271
270
269
268
267
266
265
264
this exponent TF target: 76
TF double-checked to: 67
250
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Last modified: 2024-02-09T03:30:02+00:00