is 2 20598971 - 1
has 6200909 decimal digits
takes 14.598 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
Actual27011.600164.2857 %----11.600164.2857 %
Target2695.795863.7681 %150000225000001.40543.7739 %7.201265.1355 %
Difference+1+5.8044+0.5176 %-150000-22500000-1.4054-3.7739 %+4.3989-0.8498 %

Known prime factors (6 factors, 231.2 bits, 0.00112255% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2059897141197943825.2961
1
2011-07-04112.171e-131.028e-62.091e-6
2059897158089098231032.436141
3 × 47
2008-09-083472.862e-115.546e-66.274e-6
2059897184455781111032.976205
5 × 41
2008-09-085412.901e-117.153e-61.046e-5
20598971527745637031135.6191281
3 × 7 × 61
2008-09-087612.838e-101.022e-51.464e-5
205989712637486067148711547.9066401985
3 × 5 × 426799
2008-10-0154267991.557e-60.02390.0446
205989711442066499315913271857.00093500336253
3 × 4657 × 250543
2011-07-0446572505430.00140.01860.0262

57 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-07-04AxonManual testing2582.2970.9410.000%


Trial Factoring results:
5758596061626364656667686970
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2008-09-08Will EdgingtonManual testing??
32.436
10
2008-09-08Will EdgingtonManual testing??
32.976
10
2008-09-08Will EdgingtonManual testing??
35.619
11
2008-10-01markrManual testing??
47.906
15
2.79130e-7
2019-06-18Seth_TrManual testing266267
2019-06-20Seth_TrManual testing267268
2023-01-27LordJuliusManual testing268270
32.436
32.976
35.619
10
10
11


ECM factoring results:
No ECM results for M20598971


Lucas-Lehmer results:
No L-L results for M20598971


PRP results:
No PRP results for M20598971


CERT results:
No CERT results for M20598971


P-1 factor-bounds graph:
100
101
102
103
104
100
101
102
103
104
105
106
TF factor-bounds graph:
270
268
267
this exponent TF target: 69
TF double-checked to: 67
250
260
270
JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00