is 2 158898851 - 1
has 47833321 decimal digits
takes 1,042.774 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
Actual27424.077462.1622 %10000003600000027.66095.6116 %51.738364.2855 %
Target278385.254664.1026 %1000000180000000102.31593.8952 %487.570565.5009 %
Difference-4-361.1772-1.9404 %--144000000-74.6550+1.7163%-435.8322-1.2154 %

Known prime factors (1 factor, 79.5 bits, 0.00005000% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1588988518287174337808814940694312479.4552607688565919465
3 × 5 × 7 × 47 × 89 × 317 × 18729203
2021-04-0331718729203770.519.71318.135

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2021-04-03KrieselManual testing10000003600000022479.45528.693.895%


Trial Factoring results:
57585960616263646566676869707172737475767778
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-06-28Torchwood InstituteJupiter2632640.012
2011-01-31Sara22642650.024
2012-01-15Never Odd Or EvenManual testing2652680.329
2012-01-15Never Odd Or EvenManual testing2682690.376
2012-01-15Never Odd Or EvenManual testing2692700.752
2012-03-03Never Odd Or EvenManual testing2702711.505
2012-03-03Never Odd Or EvenManual testing2712723.010
2013-03-10Never Odd Or EvenManual testing2722736.020
2013-03-10Never Odd Or EvenManual testing27327412.04


ECM factoring results:
No ECM results for M158898851


Lucas-Lehmer results:
No L-L results for M158898851


PRP results:
No PRP results for M158898851


CERT results:
No CERT results for M158898851


P-1 factor-bounds graph:
B1 = 1000000, B2 = 36000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 78
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00