is 2 148000553 - 1
has 44552606 decimal digits
takes 848.691 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
Actual27425.850362.1622 %22050007111125049.54986.7169 %75.400264.7037 %
Target277206.811263.6364 %90000017000000084.08834.1405 %290.899565.1420 %
Difference-3-180.9608-1.4742 %+1305000-98888750-34.5385+2.5764%-215.4993-0.4383 %

Known prime factors (1 factor, 78.7 bits, 0.00005320% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1480005535018539514889925653825112478.7321695446203802335
5 × 463 × 16447 × 44529347
2020-08-101644744529347413.6220.30237.677

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2020-08-10timbitManual testing220500071111250622478.73249.555.209%


Trial Factoring results:
575859606162636465666768697071727374757677
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2011-01-04BloodIceMjolnir42642650.025
2013-01-03Viba ITec0808082652660.050
2015-03-10ANONYMOUSi7-4770k2662670.101
2016-03-31DerekManual testing2672680.202
2016-06-12Mihai PredaManual testing2682690.404
2016-07-02Mihai PredaManual testing2692700.808
2016-07-28Mihai PredaManual testing2702711.616
2016-08-08Josh FamestadManual testing2712723.231
2017-02-22guruManual testing2722736.463
2018-12-27mikrManual testing27327412.93


ECM factoring results:
No ECM results for M148000553


Lucas-Lehmer results:
No L-L results for M148000553


PRP results:
No PRP results for M148000553


CERT results:
No CERT results for M148000553


P-1 factor-bounds graph:
B1 = 2205000, B2 = 71111250 (P-1 stage 2)
B1 = 2205000 (P-1 stage 1)
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108
TF factor-bounds graph:
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271
270
269
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this exponent TF target: 77
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00