is 2 15153421 - 1
has 4561635 decimal digits
takes 7.600 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
Actual2671.960964.1791 %49400091571865036.621111.3216 %38.582068.2346 %
Target2697.878565.2174 %100000130000000.58382.9978 %8.462466.2601 %
Difference-2-5.9177-1.0383 %+394000+902718650+36.0373+8.3238%+30.1196+1.9745 %

Known prime factors (1 factor, 74.1 bits, 0.00048912% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15153421205159988423938466078472374.119676942811870463
32 × 23 × 6029 × 6397 × 84793
2002-08-31639784793252.480.00780.0095

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-08-31ANONYMOUSv4_computers2374.119-0.000%
2004-09-02ANONYMOUSv4_computers2374.119-0.000%
2005-02-12ANONYMOUSv4_computers2374.119-0.000%
2023-05-20JacobZPM1Server494000915718650
skipped known factor: 20515998842393846607847
--41.589.634%


Trial Factoring results:
57585960616263646566676869
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-12-31Net_Forcev4_computers212570.001
2000-12-31Net_Forcev4_computers212580.003
2002-05-05ITSv4_computers212650.247


ECM factoring results:
No ECM results for M15153421


Lucas-Lehmer results:
No L-L results for M15153421


PRP results:
dateuseridcompidcofactorsres64
2023-06-23Bricyn Jameson7950x-1
20515998842393846607847
D362B71BCF124EF9


CERT results:
dateuseridcompid
2023-06-23LOBESYOGA740B


P-1 factor-bounds graph:
B1 = 494000, B2 = 915718650 (P-1 stage 2)
B1 = 494000 (P-1 stage 1)
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102
103
104
105
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109
TF factor-bounds graph:
265
258
257
this exponent TF target: 69
TF double-checked to: 67
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Last modified: 2024-02-09T03:30:02+00:00