is 2 421 - 1
has 127 decimal digits
takes 0.000 GHz-days to do one PRP test
Has been fully factored.
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 PRP tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP1A4E2FAEF636928DPRP-tested
Cofactor is a certified prime

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26770,579.376686.5672 %----70,579.376686.5672 %
Target2440.005679.5455 %500500000.00000.4527 %0.005679.6380 %
Difference+23+70,579.3710+7.0217 %-500-500000.0000-0.4527 %+70,579.3710+6.9291 %

Known prime factors (2 factor, 421.0 bits, 100.00000000% known):
Remaining cofactor is a certified-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4216140029283075991549.125729219629819
729219629819
-17292196298190.30530.58571.0939
421
click to show decimal representation
112371.875

P-1 results:
No P-1 results for M421


Trial Factoring results:
5758596061626364656667
No TF results for M421


ECM factoring results:
No ECM results for M421


Lucas-Lehmer results:
No L-L results for M421


PRP results:
dateuseridcompidcofactorsres64
2018-01-24Luke_Richardswork-laptop1A4E2FAEF636928D


CERT results:
No CERT results for M421


P-1 factor-bounds graph:
100
101
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
TF factor-bounds graph:
this exponent TF target: 44
TF double-checked to: 67
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00