is 2 51928189 - 1
has 15631943 decimal digits
takes 99.481 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
Actual2704.601662.8571 %----4.601662.8571 %
Target27336.836364.3836 %340000550000009.21693.8045 %46.053265.7386 %
Difference-3-32.2348-1.5264 %-340000-55000000-9.2169-3.8045 %-41.4517-2.8815 %

Known prime factors (1 factor, 82.6 bits, 0.00015911% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
5192818974531470078717977363287032582.62471763979751650859
19 × 1181 × 2221 × 2399 × 600239
2011-01-11239960023933,5550.09710.1697

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-01-11curtiscwcm128--30l2582.6242.3200.000%


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-02-23ANONYMOUSv4_computers212544.62000e-5
2000-04-27ANONYMOUSv4_computers212560.000
2001-06-03ANONYMOUSv4_computers212570.000
2002-03-24ANONYMOUSv4_computers212580.001
2003-11-28apocalypsev4_computers212600.001
2022-04-05LordJuliusManual testing260263
2008-12-03ANONYMOUSC977D69A12632640.038
2008-12-04ANONYMOUSC977D69A12642660.216
2008-12-05ANONYMOUSC977D69A12662670.288
2009-06-17shanminoffice-e21602672680.576
2010-03-28Kevin JagetLaptop2682691.151
2010-09-18Kevin JagetManual testing2682703.454


ECM factoring results:
No ECM results for M51928189


Lucas-Lehmer results:
No L-L results for M51928189


PRP results:
No PRP results for M51928189


CERT results:
No CERT results for M51928189


P-1 factor-bounds graph:
102
103
104
102
103
104
105
106
TF factor-bounds graph:
270
269
268
267
266
264
263
260
258
257
256
254
this exponent TF target: 73
TF double-checked to: 67
250
260
270
280
290
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Last modified: 2024-03-13T02:15:48+00:00