is 2 64644221 - 1
has 19459850 decimal digits
takes 156.807 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
Actual27459.183464.8649 %----59.183464.8649 %
Target27459.183464.8649 %4500007000000014.91063.8591 %74.094066.2208 %
Difference----450000-70000000-14.9106-3.8591 %-14.9106-1.3559 %

Known prime factors (1 factor, 86.5 bits, 0.00013381% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
646442211096441612565610400204396092786.503848058492781288524
22 × 3 × 17 × 2333 × 97177 × 18336541
2013-12-219717718336541297,2093.83706.5629

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2013-12-21LaurVpinch2786.5034.1240.000%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-09-29Gordon Spencev4_computers212590.001
2004-02-07AxelFoxv4_computers212600.001
2022-03-30LordJuliusManual testing260263
2009-03-30NiklotJoachim2632640.030
2009-03-31glennpatglenn11-PC642642660.173
2009-04-01unconnectedgreece-E84002662670.231
2009-04-27unconnectedgreece-E84002672680.462
2009-12-04Tommy BoucherSidney2682690.925
2011-10-08america64Manual testing2692701.850
2013-06-15Carsten KossendeyManual testing2702713.699
2013-10-24tryptamine dreamerManual testing2712727.398
2013-12-02electron1897Manual testing27227314.80
2013-12-05BdotManual testing27327429.59


ECM factoring results:
No ECM results for M64644221


Lucas-Lehmer results:
No L-L results for M64644221


PRP results:
No PRP results for M64644221


CERT results:
No CERT results for M64644221


P-1 factor-bounds graph:
103
104
105
103
104
105
106
107
108
TF factor-bounds graph:
274
273
272
271
270
269
268
267
266
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