is 2 68033657 - 1
has 20480172 decimal digits
takes 171.974 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L72C389D10F235926double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual275112.472464.0000 %36000002751661770561.96779.7942 %674.440167.5259 %
Target27456.234963.5135 %4500007500000016.53663.9359 %72.771564.9496 %
Difference+1+56.2375+0.4865 %+3150000+2676661770+545.4311+5.8583%+601.6686+2.5763 %

Known prime factors (1 factor, 82.0 bits, 0.00012058% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
6803365749591779151096880478153532582.03636446504081867068
22 × 7 × 19 × 312 × 1009 × 70652851
2022-09-1110097065285126,26314.11226.352

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2014-04-16ANONYMOUS895000895000--3.2801.940%
2022-09-11Reboot ItRI_3053600000275166177022582.036626.810.527%


Trial Factoring results:
57585960616263646566676869707172737475
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-09-29Jossv4_computers212531.76000e-5
2016-03-28Mark RoseManual testing253263
2008-11-07kmdZeus2632640.028
2009-04-10rpmohnmink2642650.055
2009-04-13ANONYMOUS2652660.110
2010-01-11SAHS Math DeptHemenway2662670.220
2010-01-21ParnesiusNodeE2672680.439
2010-01-28JimCleibnitz2682690.879
2012-05-13Clown_RoyalManual testing2692701.757
2012-08-02elmghariBureau2702713.515
2014-01-30bayanneManual testing2712727.030
2015-01-12monstManual testing27227314.06
2015-03-01XyzzyManual testing27327428.12
2015-11-04Guido LorenziniManual testing27427556.24


ECM factoring results:
No ECM results for M68033657


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-12-04curtiscwcm231--25l72C389D10F235926172.0


PRP results:
No PRP results for M68033657


CERT results:
No CERT results for M68033657


P-1 factor-bounds graph:
B1 = 3600000, B2 = 2751661770 (P-1 stage 2)
B1 = 3600000 (P-1 stage 1)
B1 = 895000 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
275
274
273
272
271
270
269
268
267
266
265
264
263
253
this exponent TF target: 74
TF double-checked to: 67
250
260
270
280
290
JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00