is 2 25208641 - 1
has 7588558 decimal digits
takes 21.602 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2671.178762.6866%----1.178762.6866%0.0000%
PrimeNet2660.585862.1212%11000040000000.40004.9831%0.985964.0087%1.8875%
GPU722709.478964.2857%18000055000000.58383.7368%10.062765.6203%1.3346%
Difference-3-8.3002-1.5991%-180000-5500000-0.5838-3.7368%-8.8840-2.9337%-2.9337%

Known prime factors (2 factors, 123.7 bits, 0.00049068% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
252086419126055894809009771859.66318101046968
23 × 4012 × 14071
-1608011608010.00470.19980.4066
25208641188591682305242858312064.032374061581315
5 × 74812316263
2017-06-295748123162630.17705,064.79,459.4

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
252086411721098234013709607707059973735515688738123.695
P-1 results:
No P-1 results for M25208641


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-08-12T00:00:00Net_Forcev4_computers21256--0.000--
2001-08-24T00:00:00Mattv4_computers21258--0.002--
2022-06-24T06:17:33LordJuliusManual testing2126459.663180.00544.580.010
2017-06-29T13:22:06TJAOIManual testing264265*64.032200.03644.300.073


ECM factoring results:
No ECM results for M25208641


Lucas-Lehmer results:
No L-L results for M25208641


PRP results:
No PRP results for M25208641


P-1 factor-bounds graph:
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
267
265
264
258
256
250
260
270
280
290
2100
Last modified: 2022-06-24T06:17:33+00:00