is 2 21520699 - 1
has 6478376 decimal digits
takes 15.251 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LD1EB6D4169E9B8E8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2671.380762.6866 %2100009975000.25993.4479 %1.640663.9731 %
Target2695.547563.7681 %160000225000001.41513.8352 %6.962765.1577 %
Difference-2-4.1668-1.0815 %+50000-21502500-1.1553-0.3873 %-5.3221-1.1846 %

Known prime factors (1 factor, 73.1 bits, 0.00033956% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2152069999512725151562493341772273.075231202353491312
24 × 7 × 179 × 42491 × 271409
2009-07-214249127140988.8840.05650.0889

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-12-13ANONYMOUSv4_computers210000997500--0.2602.762%
2009-07-20Rob_Deetwopc250000250000--0.2941.689%
2009-07-21Rob_Deetwopc2273.0750.3530.000%


Trial Factoring results:
57585960616263646566676869
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2002-12-16ANONYMOUSv4_computers212660.347


ECM factoring results:
No ECM results for M21520699


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2005-01-10ANONYMOUSv4_computersD1EB6D4169E9B8E815.25


PRP results:
No PRP results for M21520699


CERT results:
No CERT results for M21520699


P-1 factor-bounds graph:
B1 = 210000, B2 = 997500 (P-1 stage 2)
B1 = 250000 (P-1 stage 1)
B1 = 210000 (P-1 stage 1)
103
104
105
106
103
104
105
106
TF factor-bounds graph:
266
this exponent TF target: 69
TF double-checked to: 67
250
260
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280
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Last modified: 2024-02-09T03:30:02+00:00