is 2 252559921 - 1
has 76028112 decimal digits
takes 2,750.097 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
Actual2700.946160.0000 %1000002000001.66491.9576 %2.611060.7830 %
Target279484.768964.5570 %1600000325000000303.45814.4139 %788.227066.1214 %
Difference-9-483.8228-4.5570 %-1500000-324800000-301.7932-2.4563 %-785.6159-5.3383 %

Known prime factors (1 factor, 77.4 bits, 0.00003064% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2525599211968138291786949995428392477.381389637889494539
7 × 313 × 421 × 3319 × 127271
2019-03-233319127271157.370.15900.2045

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2019-03-23MadPooManual testing10000020000022477.3811.7410.596%


Trial Factoring results:
5758596061626364656667686970717273747576777879
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-03-03Torchwood InstitutePhenom95502622630.004
2010-03-03Torchwood InstitutePhenom95502632640.008
2011-07-29Andrew Bdell_xps_8100_i7_x862642650.015
2014-08-08James Hintz08_04_20142652660.030
2014-11-02caddrManual testing2662680.178
2017-04-13mikrManual testing2682690.237
2017-04-13mikrManual testing2692700.473


ECM factoring results:
No ECM results for M252559921


Lucas-Lehmer results:
No L-L results for M252559921


PRP results:
No PRP results for M252559921


CERT results:
No CERT results for M252559921


P-1 factor-bounds graph:
B1 = 100000, B2 = 200000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
102
103
104
105
102
103
104
105
106
TF factor-bounds graph:
270
269
268
266
265
264
263
this exponent TF target: 79
TF double-checked to: 67
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00