is 2 168515861 - 1
has 50728329 decimal digits
takes 1,146.844 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
Actual27422.703362.1622 %----22.703362.1622 %
Target278363.268564.1026 %1000000200000000116.85823.9984 %480.126765.5379 %
Difference-4-340.5652-1.9404 %-1000000-200000000-116.8582-3.9984 %-457.4234-3.3757 %

Known prime factors (1 factor, 83.7 bits, 0.00004970% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
168515861162149721713556056203974232683.74648111115698941851
51287 × 374537 × 2504629
2015-08-12374537250462911,6254.84127.5219

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2015-08-12La GüiraLa_undecima2683.74641.730.000%


Trial Factoring results:
57585960616263646566676869707172737475767778
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-07-08subgeniusgigacare2632640.012
2011-02-17marvikts052642650.022
2012-01-14Never Odd Or EvenManual testing2652680.310
2012-01-14Never Odd Or EvenManual testing2682690.355
2012-01-14Never Odd Or EvenManual testing2692700.710
2012-03-11Never Odd Or EvenManual testing2702711.419
2012-03-11Never Odd Or EvenManual testing2712722.838
2013-03-08Never Odd Or EvenManual testing2722735.676
2013-03-08Never Odd Or EvenManual testing27327411.35


ECM factoring results:
No ECM results for M168515861


Lucas-Lehmer results:
No L-L results for M168515861


PRP results:
No PRP results for M168515861


CERT results:
No CERT results for M168515861


P-1 factor-bounds graph:
104
105
106
104
105
106
107
TF factor-bounds graph:
274
273
272
271
270
269
268
265
264
this exponent TF target: 78
TF double-checked to: 67
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00