is 2 10038521 - 1
has 3021896 decimal digits
takes 2.928 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 PRP tests remaining
ResidueStatus
L-L4C0F8B1C2773F5EDdouble-checked
PRPFE089FFA5852E5__PRP-tested

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26911.892965.2174 %50000500000.02110.6012 %11.914065.4265 %
Target2685.937664.7059 %6500075000000.19882.5694 %6.136465.6127 %
Difference+1+5.9553+0.5115 %-15000-7450000-0.1777-1.9681 %+5.7776-0.1862 %

Known prime factors (1 factor, 82.9 bits, 0.00082557% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1003852188694136959851391099777932582.875441768946639905376
25 × 149 × 7457 × 42407 × 292993
2011-04-2842407292993159,9990.02370.0365

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-08-31ANONYMOUSv4_computers5000050000--0.0210.701%
2011-04-28James Heinrichi7-9202582.8750.1450.000%


Trial Factoring results:
57585960616263646566676869
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-10-15subgeniusv4_computers212640.196
2011-04-23James HeinrichManual testing2642650.372
2022-03-13LordJuliusManual testing265267
2021-10-30ViliamFManual testing267268
2021-12-28ViliamFManual testing268269


ECM factoring results:
No ECM results for M10038521


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-12-07ANONYMOUSv4_computers4C0F8B1C2773F5ED2.928
2004-01-18twstdpearv4_computers4C0F8B1C2773F5ED2.928


PRP results:
dateuseridcompidcofactorsres64
2019-12-18mrhx
8869413695985139109977793
FE089FFA5852E53F
2021-01-21Oliver KruseIOS-5
8869413695985139109977793
FE089FFA5852E53F


CERT results:
dateuseridcompid
2021-01-21curtiscjckl2f11398l


P-1 factor-bounds graph:
B1 = 50000 (P-1 stage 1)
103
104
105
103
104
105
106
TF factor-bounds graph:
269
268
267
265
264
this exponent TF target: 68
TF double-checked to: 67
250
260
270
280
290
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Last modified: 2024-03-13T02:15:48+00:00