is 2 25216291 - 1
has 7590860 decimal digits
takes 21.609 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LC409139D9F00A2C1double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2682.363763.2353 %29000060175000.74814.9878 %3.111865.0690 %
Target2709.476064.2857 %180000275000002.07323.7369 %11.549265.6203 %
Difference-2-7.1123-1.0504 %+110000-21482500-1.3251+1.2508%-8.4374-0.5513 %

Known prime factors (1 factor, 67.7 bits, 0.00026850% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
252162912405960300503708535532167.7054770646683336
23 × 32 × 19 × 8117 × 429631
2016-01-0481174296311.43390.03860.0543

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2004-09-02ANONYMOUSv4_computers2900006017500--0.7484.075%


Trial Factoring results:
5758596061626364656667686970
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-08-12Net_Forcev4_computers212560.000
2001-08-24Mattv4_computers212580.002
2003-12-31markrv4_computers212620.012
2004-07-02ANONYMOUSv4_computers212670.593
2016-01-04VictordeHollanderManual testing267268
67.705
21
0.836


ECM factoring results:
No ECM results for M25216291


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2005-01-20ANONYMOUSv4_computersC409139D9F00A2C121.61
2011-02-14ANONYMOUSA5D12CB34AE4092925.08
2011-09-12forrest-lumpkinThinkCP_WestmereC409139D9F00A2C121.61


PRP results:
No PRP results for M25216291


CERT results:
No CERT results for M25216291


P-1 factor-bounds graph:
B1 = 290000, B2 = 6017500 (P-1 stage 2)
B1 = 290000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
TF factor-bounds graph:
268
267
262
258
256
this exponent TF target: 70
TF double-checked to: 67
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00