is 2 66301883 - 1
has 19958856 decimal digits
takes 167.596 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
Actual27457.703764.8649 %5950005950002.18081.6277 %59.884665.4367 %
Target27457.703764.8649 %4500007500000016.53663.9232 %74.240366.2433 %
Difference---+145000-74405000-14.3558-2.2956 %-14.3558-0.8066 %

Known prime factors (1 factor, 88.7 bits, 0.00013371% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
663018834871963367465562711755344472788.6553674076170254140981
3 × 11 × 17 × 673 × 6701 × 12011 × 120907
2014-08-31120111209071,060,2680.06580.0896

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2014-08-31NesowaEPC59500059500012788.6552.1811.628%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2009-05-311997rj7Manual testing212640.030
2009-11-28unconnectedtestQ66002642650.056
2009-11-30unconnectedtestQ66002652660.113
2010-02-03SAHS Physics Clubphysicsclub92662670.225
2010-06-02Sid & AndyHamm2672680.451
2010-06-05Andrew Bhp_laptop2682690.902
2013-04-12Torben K.Manual testing2692715.410
2014-04-01Gordon SpenceManual testing2712727.213
2014-06-26Mark RoseManual testing27227443.28


ECM factoring results:
No ECM results for M66301883


Lucas-Lehmer results:
No L-L results for M66301883


PRP results:
No PRP results for M66301883


CERT results:
No CERT results for M66301883


P-1 factor-bounds graph:
B1 = 595000 (P-1 stage 1)
103
104
105
106
103
104
105
106
TF factor-bounds graph:
274
272
271
269
268
267
266
265
264
this exponent TF target: 74
TF double-checked to: 67
250
260
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Last modified: 2024-03-13T02:15:48+00:00