is 2 12820243 - 1
has 3859278 decimal digits
takes 5.237 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
Actual2672.317764.1791 %40000042845985014.05019.9973 %16.367867.7602 %
Target2684.649364.7059 %90000120000000.43763.1624 %5.086965.8220 %
Difference-1-2.3315-0.5268 %+310000+416459850+13.6125+6.8350%+11.2809+1.9382 %

Known prime factors (3 factors, 154.2 bits, 0.00120299% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
12820243124455842185691443.501485388
22 × 32 × 97 × 139
-971399.710e-85.881e-50.0001
12820243204452533155272471754.183797381661
3 × 53 × 5014979
2014-11-085350149790.00030.16190.3023
128202431049615521634503691856.5434093586688
28 × 3 × 5330191
2015-04-1025653301910.00130.17210.3213

4 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2022-04-21nordisweet16_30.8b14400000400000
skipped known factor: 12445584218569
--0.2372.162%
2022-05-12nordisweet16_30.8b14400000428459850
skipped known factor: 12445584218569
skipped known factor: 20445253315527247
skipped known factor: 104961552163450369
--16.479.190%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2014-11-08TJAOIManual testing254255*
54.183
17
3.41841e-5
2015-04-10TJAOIManual testing256257*
56.543
18
0.000


ECM factoring results:
No ECM results for M12820243


Lucas-Lehmer results:
No L-L results for M12820243


PRP results:
dateuseridcompidcofactorsres64
2022-05-31Ember_EdisonMainServer
12445584218569
20445253315527247
104961552163450369
6B765DB576CFFF2A


CERT results:
dateuseridcompid
2022-05-31curtischum317--14l


P-1 factor-bounds graph:
B1 = 400000, B2 = 428459850 (P-1 stage 2)
B1 = 400000 (P-1 stage 1)
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109
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