is 2 87908021 - 1
has 26462952 decimal digits
takes 296.364 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
Actual276174.091064.4737 %715000141212507.06573.5067 %181.156765.7195 %
Target27587.044564.0000 %60000010000000029.40654.0455 %116.451065.4564 %
Difference+1+87.0465+0.4737 %+115000-85878750-22.3408-0.5387 %+64.7057+0.2631 %

Known prime factors (1 factor, 85.3 bits, 0.00009699% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
87908021463599722920990723445838012685.261263684540754813900
22 × 3 × 52 × 23 × 419687 × 91056313
2018-07-2341968791056313123,86426.19145.295

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2018-07-23Oliver KruseManual testing715000141212501222685.2617.5923.863%


Trial Factoring results:
5758596061626364656667686970717273747576
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-11-17Architects Cubedm1_672642650.043
2013-09-02Preben SManual testing2652670.255
2013-09-03S04803Manual testing2672680.340
2013-09-05S04803Manual testing2682690.680
2013-09-06S04803Manual testing2692701.360
2014-03-06ANONYMOUSManual testing2702712.720
2014-03-06hkskypManual testing2702712.720
2017-07-01ANONYMOUSManual testing27127438.08
2018-04-12Strolling JellyfishManual testing274276130.6


ECM factoring results:
No ECM results for M87908021


Lucas-Lehmer results:
No L-L results for M87908021


PRP results:
No PRP results for M87908021


CERT results:
No CERT results for M87908021


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