is 2 64905557 - 1
has 19538520 decimal digits
takes 157.441 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
Actual27458.945164.8649 %----58.945164.8649 %
Target27458.945164.8649 %4500007000000014.91063.8611 %73.855766.2215 %
Difference----450000-70000000-14.9106-3.8611 %-14.9106-1.3566 %

Known prime factors (1 factor, 83.8 bits, 0.00012911% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
64905557167960335078035752727924972683.796129388254905535864
23 × 3 × 7 × 30697 × 41669 × 602111
2014-01-054166960211130,7300.25400.2983

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2014-01-05Team_InspectorFishbeck2683.7964.0130.000%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-10-08Gordon Spencev4_computers212590.001
2004-02-14AxelFoxv4_computers212600.001
2022-03-30LordJuliusManual testing260263
2009-03-16tmorrowteapot2632640.030
2009-03-19tmorrowteapot2642650.058
2009-03-24arnaudCHAMOT072652660.115
2009-10-06FCG PrimesNatalia2662670.230
2009-10-11David Barleyken22672680.461
2009-10-15hoyalEinstein2682690.921
2012-04-10ITSChrysalisTwo2692701.842
2012-06-08america64Manual testing2702713.684
2013-11-19america64Manual testing2712727.368
2013-12-10electron1897Manual testing27227314.74
2013-12-20leag63Manual testing27327429.47


ECM factoring results:
No ECM results for M64905557


Lucas-Lehmer results:
No L-L results for M64905557


PRP results:
No PRP results for M64905557


CERT results:
No CERT results for M64905557


P-1 factor-bounds graph:
103
104
105
103
104
105
106
TF factor-bounds graph:
274
273
272
271
270
269
268
267
266
265
264
263
260
259
this exponent TF target: 74
TF double-checked to: 67
250
260
270
280
290
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Last modified: 2024-03-13T02:15:48+00:00