is 2 168975887 - 1
has 50866811 decimal digits
takes 1,149.975 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
Actual27311.320261.6438 %----11.320261.6438 %
Target278362.279564.1026 %1000000200000000116.85823.9997 %479.137765.5383 %
Difference-5-350.9593-2.4587 %-1000000-200000000-116.8582-3.9997 %-467.8175-3.8945 %

Known prime factors (1 factor, 73.3 bits, 0.00004336% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
168975887113105376878112297689692373.26033467904470332
22 × 607 × 21157 × 651517
2015-08-242115765151711.3200.54770.6542

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2015-08-24La GüiraLa_undecima2373.26017.610.000%


Trial Factoring results:
57585960616263646566676869707172737475767778
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-07-09EPFEPF_012632640.012
2011-02-18sasaki3mate_ma12642650.022
2013-03-25Charles A. Morrischandra2652660.044
2013-11-20bayanneManual testing2662680.265
2013-11-20bayanneManual testing2682690.354
2013-11-20bayanneManual testing2692700.708
2015-06-04La GüiraManual testing2702711.415
2015-06-13La GüiraManual testing2712722.830
2015-06-27La GüiraManual testing2722735.661


ECM factoring results:
No ECM results for M168975887


Lucas-Lehmer results:
No L-L results for M168975887


PRP results:
No PRP results for M168975887


CERT results:
No CERT results for M168975887


P-1 factor-bounds graph:
103
104
105
103
104
105
106
TF factor-bounds graph:
273
272
271
270
269
268
266
265
264
this exponent TF target: 78
TF double-checked to: 67
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00