is 2 108528839 - 1
has 32670436 decimal digits
takes 476.321 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
Actual276141.013264.4737 %7920002382100013.02494.0389 %154.038065.9086 %
Target276141.013264.4737 %70000012000000045.81873.9816 %186.831865.8882 %
Difference---+92000-96179000-32.7938+0.0574%-32.7938+0.0204 %

Known prime factors (1 factor, 89.5 bits, 0.00008243% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1085288398487676030572987982601821212789.4563910332087203562540
22 × 32 × 5 × 13 × 12473 × 36931 × 3627737
2022-01-143693136277371,155,1931.48002.3493

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2022-01-14MarkSdesktop-i779200023821000622789.45612.174.039%


Trial Factoring results:
5758596061626364656667686970717273747576
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-05-02Richardsvn_022632640.018
2010-09-11abcC30D35CA52642650.034
2012-05-22sasaki3MATE_J22652660.069
2014-07-21S00030vd032662670.138
2014-11-20g0bManual testing2672680.275
2015-04-03g0bManual testing2682690.551
2015-04-09ITSLJCA_-_ServerStation2692701.102
2015-04-15ITSLJCA_-_ServerStation2702712.203
2019-01-27Niels_Mache_NextcloudManual testing2712724.407
2019-09-30Niels_Mache_NextcloudManual testing2722738.813
2019-09-30Niels_Mache_NextcloudManual testing27327417.63
2021-04-26TheJudgerManual testing27427535.25
2021-04-26TheJudgerManual testing27527670.51


ECM factoring results:
No ECM results for M108528839


Lucas-Lehmer results:
No L-L results for M108528839


PRP results:
No PRP results for M108528839


CERT results:
No CERT results for M108528839


P-1 factor-bounds graph:
B1 = 792000, B2 = 23821000 (P-1 stage 2)
B1 = 792000 (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
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Last modified: 2024-02-09T03:30:02+00:00