is 2 63637621 - 1
has 19156833 decimal digits
takes 149.489 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
Actual27460.119664.8649 %----60.119664.8649 %
Target27460.119664.8649 %4000007000000014.27863.7882 %74.398266.1959 %
Difference----400000-70000000-14.2786-3.7882 %-14.2786-1.3310 %

Known prime factors (1 factor, 91.8 bits, 0.00014431% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
6363762144086921175845079474622123372891.83234639039363087661208
23 × 3 × 72 × 17 × 29 × 269 × 254747 × 871867
2013-10-132547478718678,166,9140.98221.7659

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2013-10-13TheJudgerManual testing2891.8322.9320.000%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-08-25Gordon Spencev4_computers212590.001
2022-03-30LordJuliusManual testing21263
2009-02-24Wojciech Florekarmada22632640.031
2009-02-28ANONYMOUS2642650.059
2009-03-01Old Dufferhomegrown2652660.117
2009-12-09Hatchwlap2662670.235
2009-12-12korvadualcore12672680.470
2010-02-20Peter_Simonamd642682690.939
2012-01-03ANONYMOUS2692701.879
2012-08-23SWL551Manual testing2702713.758
2013-07-01TheJudgerManual testing27127322.55
2013-10-09A_SavchenkoManual testing27327430.06


ECM factoring results:
No ECM results for M63637621


Lucas-Lehmer results:
No L-L results for M63637621


PRP results:
No PRP results for M63637621


CERT results:
No CERT results for M63637621


P-1 factor-bounds graph:
104
105
106
104
105
106
TF factor-bounds graph:
274
273
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