is 2 62156117 - 1
has 18710856 decimal digits
takes 146.009 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27330.774864.3836 %----30.774864.3836 %
Target27461.552564.8649 %4000006500000013.35073.7230 %74.903266.1729 %
Difference-1-30.7777-0.4813 %-400000-65000000-13.3507-3.7230 %-44.1284-1.7894 %

Known prime factors (1 factor, 91.2 bits, 0.00014676% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
6215611728853017737986627127258278892891.22123210119237328344632
23 × 3 × 239 × 30941 × 102499 × 1275893
2013-03-25102499127589315,738,2010.56690.7105

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2013-03-25Amazon EC22891.2214.1800.000%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-06-30Gordon Spencev4_computers212590.001
2022-03-30LordJuliusManual testing21263
2008-12-18DerekDerek_Desk2632640.032
2009-08-11stevecodyMacPro2642650.060
2009-08-12oodaira052652660.120
2009-08-14jschmittwork2662670.240
2009-08-18ANONYMOUS42672680.481
2009-08-24ANONYMOUS42682690.962
2011-12-03Helmut Zulusvibra2692701.924
2012-11-02NoWhereMani7-3930K2702713.847
2013-02-15bcp19Manual testing2712727.694
2013-03-18James HeinrichManual testing27227315.39


ECM factoring results:
No ECM results for M62156117


Lucas-Lehmer results:
No L-L results for M62156117


PRP results:
No PRP results for M62156117


CERT results:
No CERT results for M62156117


P-1 factor-bounds graph:
104
105
106
104
105
106
107
TF factor-bounds graph:
273
272
271
270
269
268
267
266
265
264
263
259
this exponent TF target: 74
TF double-checked to: 67
250
260
270
280
290
2100
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Last modified: 2024-03-13T02:15:48+00:00