is 2 25473401 - 1
has 7668258 decimal digits
takes 21.829 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LA7F5D28ED80068ACdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27118.767764.7887%24000011400000.35912.3826%19.126965.6277%0.8389%
PrimeNet2660.579862.1212%12000045000000.44565.1688%1.025464.0791%1.9579%
GPU722709.380464.2857%18000055000000.58383.7421%9.964265.6222%1.3365%
Difference+1+9.3873+0.5030%+60000-4360000-0.2247-1.3595%+9.1627+0.0055%+0.0055%

Known prime factors (1 factor, 67.4 bits, 0.00026441% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
254734011887235556827337775292167.3553704325851164
22 × 41 × 53 × 426176467
2011-11-17534261764671.502728.85253.887

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-09-16T00:00:00ANONYMOUSv4_computers2400001140000---0.359--2.383%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2011-11-17T23:13:00Carsten KossendeyManual testing??67.355210.33644.460.685
2001-08-12T00:00:00Net_Forcev4_computers21256--0.000--
2001-09-30T00:00:00Mattv4_computers21258--0.002--
2001-11-03T00:00:00Mattv4_computers21258--0.002--
2004-08-06T00:00:00ANONYMOUSv4_computers21267--1.166--
2011-11-17T23:13:00Carsten KossendeyManual testing267271--17.60--


ECM factoring results:
No ECM results for M25473401


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2005-02-02T00:00:00siumingv4_computersA7F5D28ED80068AC21.83


PRP results:
No PRP results for M25473401


P-1 factor-bounds graph:
B1 = 240000, B2 = 1140000 (P-1 stage 2)
B1 = 240000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
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109
TF factor-bounds graph:
271
267
258
256
2
250
260
270
280
290
2100
Last modified: 2011-11-17T23:13:26+00:00