is 2 25171897 - 1
has 7577497 decimal digits
takes 21.571 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
Actual2671.180462.6866%----1.180462.6866%0.0000%
PrimeNet2660.586762.1212%11000040000000.40004.9821%0.986764.0084%1.8872%
GPU722709.492864.2857%18000055000000.58383.7361%10.076665.6200%1.3343%
Difference-3-8.3123-1.5991%-180000-5500000-0.5838-3.7361%-8.8961-2.9335%-2.9335%

Known prime factors (2 factors, 120.5 bits, 0.00047890% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
251718972802870864785449671857.9605567460539
317 × 457 × 38431
2001-08-24457384310.00080.00310.0049
2517189769343413639522002871962.588137739745319
11 × 443 × 28265903
2016-09-06443282659030.05121.91413.5740

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
25171897194360633754982182091083435791980552937120.548
P-1 results:
No P-1 results for M25171897


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-08-24T00:00:00Mattv4_computers??57.960182.95508e-544.536.09992e-5
2001-08-12T00:00:00Net_Forcev4_computers21256--0.000--
2022-06-24T06:17:31LordJuliusManual testing2126257.960180.00144.530.002
2016-09-06T15:20:33TJAOIManual testing262263*62.588190.02744.470.055


ECM factoring results:
No ECM results for M25171897


Lucas-Lehmer results:
No L-L results for M25171897


PRP results:
No PRP results for M25171897


P-1 factor-bounds graph:
101
102
103
101
102
103
104
105
106
107
108
TF factor-bounds graph:
267
263
262
256
2
250
260
270
280
290
2100
Last modified: 2022-06-24T06:17:31+00:00