is 2 87881069 - 1
has 26454838 decimal digits
takes 296.273 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
Actual276174.144464.4737 %715000141212507.06573.5066 %181.210165.7195 %
Target27587.071264.0000 %60000010000000029.40654.0453 %116.477765.4563 %
Difference+1+87.0732+0.4737 %+115000-85878750-22.3408-0.5387 %+64.7324+0.2631 %

Known prime factors (1 factor, 78.1 bits, 0.00008883% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
878810693164846192447669178158332478.0661800641610565564
22 × 13 × 131 × 24121 × 10958657
2018-07-232412110958657823.843.03015.4512

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2018-07-23Oliver KruseManual testing715000141212501222478.0667.5923.863%


Trial Factoring results:
5758596061626364656667686970717273747576
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-11-19Architects Cubedm1_802642650.043
2013-03-08Freaks32Manual testing2652660.085
2013-03-18ANONYMOUS2662670.170
2013-03-23symalladPLTW2672680.340
2013-03-29ArtfulDodgerDodger-12682690.680
2013-08-19RobishManual testing2692701.361
2013-11-20PascalBieriManual testing2702712.721
2017-07-14ANONYMOUSManual testing27127438.09
2018-04-29Strolling JellyfishManual testing274276130.6


ECM factoring results:
No ECM results for M87881069


Lucas-Lehmer results:
No L-L results for M87881069


PRP results:
No PRP results for M87881069


CERT results:
No CERT results for M87881069


P-1 factor-bounds graph:
B1 = 715000, B2 = 14121250 (P-1 stage 2)
B1 = 715000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
TF factor-bounds graph:
276
274
271
270
269
268
267
266
265
this exponent TF target: 75
TF double-checked to: 67
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00