is 2 26887921 - 1
has 8094071 decimal digits
takes 24.890 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L59F27506E3A38704double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27117.780464.7887%4200004200000.56371.7336%18.344265.3991%0.6104%
PrimeNet2660.549362.1212%12000045000000.48145.2059%1.030664.0932%1.9719%
GPU722708.886964.2857%20000060000000.69263.8990%9.579565.6782%1.3925%
Difference+1+8.8935+0.5030%+220000-5580000-0.1289-2.1654%+8.7646-0.2791%-0.7821%

Known prime factors (1 factor, 67.0 bits, 0.00024931% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
268879211511733781390738218892167.0352811176404064
25 × 7 × 59 × 212710079
2011-11-15592127100791.260115.55629.053

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-12-23T00:00:00ANONYMOUSv4_computers420000420000---0.564--1.734%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2011-11-15T12:09:00Carsten KossendeyManual testing??67.035210.15550.740.316
2002-06-02T00:00:00Jocelyn Larouchev4_computers21257--0.001--
2004-10-18T00:00:00ANONYMOUSv4_computers21267--1.105--
2011-11-15T12:09:00Carsten KossendeyManual testing267271--16.68--


ECM factoring results:
No ECM results for M26887921


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2005-07-17T00:00:00Johnv4_computers59F27506E3A3870424.89


PRP results:
No PRP results for M26887921


P-1 factor-bounds graph:
B1 = 420000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
271
267
257
2
250
260
270
280
290
2100
Last modified: 2011-11-15T12:09:31+00:00