is 2 28526503 - 1
has 8587334 decimal digits
takes 28.368 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LD613AA8EAA651793double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27116.759164.7887 %33000082500001.09804.0572 %17.857166.2173 %
Target2708.376464.2857 %200000325000002.82593.9933 %11.202465.7119 %
Difference+1+8.3826+0.5030 %+130000-24250000-1.7279+0.0640%+6.6548+0.5055 %

Known prime factors (1 factor, 68.7 bits, 0.00024077% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
285265034743073962024997993432168.6848313451463057
13 × 19 × 31 × 1085732201
2012-02-033110857322013.403685.296159.31

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2007-02-20ANONYMOUSv4_computers33000082500006--1.0984.486%


Trial Factoring results:
575859606162636465666768697071
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2012-02-03Carsten KossendeyManual testing??
68.684
21
3.524
2001-08-24Net_Forcev4_computers212560.000
2004-11-03markrv4_computers212620.011
2005-03-20ITSv4_computers212681.048
2012-02-03Carsten KossendeyManual testing26827114.67


ECM factoring results:
No ECM results for M28526503


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2007-12-31Sturle Sundev4_computersD613AA8EAA65179328.37


PRP results:
No PRP results for M28526503


CERT results:
No CERT results for M28526503


P-1 factor-bounds graph:
B1 = 330000, B2 = 8250000 (P-1 stage 2)
B1 = 330000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
271
268
262
256
this exponent TF target: 70
TF double-checked to: 67
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00