is 2 28922821 - 1
has 8706637 decimal digits
takes 28.762 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L4687BC530D2BC679double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27116.529464.7887 %4150004150000.59841.7438 %17.127965.4028 %
Target2708.261764.2857 %220000325000002.85324.0573 %11.114865.7348 %
Difference+1+8.2678+0.5030 %+195000-32085000-2.2548-2.3135 %+6.0130-0.3320 %

Known prime factors (1 factor, 68.6 bits, 0.00023722% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
289228214509720975504863197992168.6127796129180319
36 × 10694278711
2011-12-10729106942787113.2057840.161,569.2

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2006-03-01ANONYMOUSv4_computers415000415000--0.5981.963%


Trial Factoring results:
575859606162636465666768697071
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2011-12-10Carsten KossendeyManual testing??
68.612
21
3.325
2001-08-24Net_Forcev4_computers212560.000
2004-09-16ANONYMOUSv4_computers212620.011
2005-04-11korvav4_computers212681.033
2011-12-10Carsten KossendeyManual testing26827114.47


ECM factoring results:
No ECM results for M28922821


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2006-03-28ANONYMOUSv4_computers4687BC530D2BC67928.76


PRP results:
No PRP results for M28922821


CERT results:
No CERT results for M28922821


P-1 factor-bounds graph:
B1 = 415000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
1010
1011
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