is 2 12871051 - 1
has 3874573 decimal digits
takes 5.257 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 PRP tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP36C73C3762E6C16BPRP-tested

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2672.308664.1791 %40000042845985014.050110.0014 %16.358767.7617 %
Target2684.630964.7059 %90000120000000.43763.1642 %5.068665.8227 %
Difference-1-2.3223-0.5268 %+310000+416459850+13.6125+6.8372%+11.2901+1.9390 %

Known prime factors (2 factors, 99.6 bits, 0.00077370% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1287105121623365691031.01084
22 × 3 × 7
-472.263e-112.466e-64.822e-6
128710514392548503929979782172168.57417063674535708
22 × 17 × 227 × 1063 × 1039931
2022-05-17106310399317.83600.03420.0627

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2022-05-15nordisweet16_30.8b14400000400000
skipped known factor: 2162336569
--0.2372.163%
2022-05-17nordisweet16_30.8b1440000042845985022168.57416.479.193%


Trial Factoring results:
575859606162636465666768
No TF results for M12871051


ECM factoring results:
No ECM results for M12871051


Lucas-Lehmer results:
No L-L results for M12871051


PRP results:
dateuseridcompidcofactorsres64
2022-05-23XZTM900Tiny1
2162336569
439254850392997978217
36C73C3762E6C16B


CERT results:
dateuseridcompid
2022-05-23Yank_In_London


P-1 factor-bounds graph:
B1 = 400000, B2 = 428459850 (P-1 stage 2)
B1 = 400000 (P-1 stage 1)
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TF factor-bounds graph:
this exponent TF target: 68
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00