is 2 83876783 - 1
has 25249428 decimal digits
takes 261.736 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
Actual276182.458064.4737 %6700006700003.03161.4077 %185.489664.9738 %
Target27591.228064.0000 %5500009500000025.77233.9377 %117.000265.4176 %
Difference+1+91.2301+0.4737 %+120000-94330000-22.7407-2.5300 %+68.4894-0.4438 %

Known prime factors (1 factor, 85.8 bits, 0.00010229% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
83876783671651979185564470128792232685.796400380150002632117
19 × 137 × 13577 × 74771 × 151517
2017-09-2974771151517173,0280.35720.6885

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2017-09-29Oliver KruseHalfPM1-267000067000012685.7963.0321.581%


Trial Factoring results:
5758596061626364656667686970717273747576
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-12-21Architects Cubedm1_652642650.045
2012-08-17Carsten KossendeyManual testing2652660.089
2013-02-18SMoffatManual testing2662670.178
2013-06-13GrunwalderGIMPcompute-0-02672680.356
2013-06-14frmaralg0022682690.713
2013-06-17frmaralg0012692701.425
2013-07-24willmoreManual testing2702712.851
2017-02-03ANONYMOUSManual testing27127439.91
2017-02-06Brian BeuningManual testing27427545.62
2017-03-26TheJudgerManual testing27527691.23


ECM factoring results:
No ECM results for M83876783


Lucas-Lehmer results:
No L-L results for M83876783


PRP results:
No PRP results for M83876783


CERT results:
No CERT results for M83876783


P-1 factor-bounds graph:
B1 = 670000 (P-1 stage 1)
103
104
105
106
103
104
105
106
TF factor-bounds graph:
276
275
274
271
270
269
268
267
266
265
this exponent TF target: 75
TF double-checked to: 67
250
260
270
280
290
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Last modified: 2024-03-13T02:15:48+00:00