is 2 8510147 - 1
has 2561810 decimal digits
takes 2.222 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LFD7EC4924B0C6285double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2673.491664.1791 %400005000000.02461.9315 %3.516264.8710 %
Target2687.004064.7059 %5500060000000.14352.2888 %7.147465.5137 %
Difference-1-3.5124-0.5268 %-15000-5500000-0.1188-0.3573 %-3.6312-0.6427 %

Known prime factors (1 factor, 67.8 bits, 0.00079672% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
85101472573010120717765081112167.80215117307143565
5 × 11 × 37 × 5011 × 1482469
2012-04-10501114824694.78780.03240.0571

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-10-26ANONYMOUSv4_computers40000500000--0.0251.691%
2012-04-10bcp19Toshiba-740Q2167.8020.0730.000%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-10-04ANONYMOUSv4_computers212620.036
1998-10-11ANONYMOUSv4_computers212630.115
2002-10-26ANONYMOUSv4_computers212640.231


ECM factoring results:
No ECM results for M8510147


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-12-08Dave Scottv4_computersFD7EC4924B0C62852.222
2002-12-02ANONYMOUSv4_computersFD7EC4924B0C62852.222


PRP results:
dateuseridcompidcofactorsres64
2018-11-14Oliver KruseGTX-4
257301012071776508111
8C2B4A244EE93CF1
2020-06-24Luigi Morelli9800X
257301012071776508111
8C2B4A244EE93CF1


CERT results:
No CERT results for M8510147


P-1 factor-bounds graph:
B1 = 40000, B2 = 500000 (P-1 stage 2)
B1 = 40000 (P-1 stage 1)
102
103
104
105
102
103
104
105
106
107
TF factor-bounds graph:
264
263
262
this exponent TF target: 68
TF double-checked to: 67
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00