is 2 9878747 - 1
has 2973800 decimal digits
takes 2.881 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L3BC49364ABB1C30Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2673.007964.1791%12000023700000.10263.5711%3.110565.4583%1.2792%
PrimeNet2640.360362.5000%4500012000000.04563.6721%0.405963.8771%1.3771%
GPU722686.033664.7059%6500015000000.06062.5629%6.094265.6104%0.9046%
Difference-1-3.0258-0.5268%+55000+870000+0.0420+1.0082%-2.9837-0.1521%-0.1521%

Known prime factors (1 factor, 72.9 bits, 0.00073759% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
987874785979636167871407690012272.864435174805913500
22 × 53 × 71 × 12258445237
2015-02-1312512258445237160.52282.46527.55

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-07-30T00:00:00ANONYMOUSv4_computers45000326250---0.026--1.793%
2013-04-08T23:10:00NesowaEPC1200002370000---0.103--3.571%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-07-12T00:00:00ANONYMOUSv4_computers21264--0.360--
2013-08-24T14:29:00NesowaManual testing264265--0.378--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.444 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.444 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.444


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-08-31T00:00:00ANONYMOUSv4_computers3BC49364ABB1C30E2.881
2003-09-21T00:00:00ANONYMOUSv4_computers3BC49364ABB1C30E2.881


PRP results:
dateuseridcompidcofactorsres64PRP
2019-11-10T09:49:51mnd9printer
8597963616787140769001
B42BC6FBE991E3__no
2021-01-07T10:35:03kutensspica-b
8597963616787140769001
B42BC6FBE991E31Cno


P-1 factor-bounds graph:
B1 = 120000, B2 = 2370000 (P-1 stage 2)
B1 = 120000 (P-1 stage 1)
B1 = 45000, B2 = 326250 (P-1 stage 2)
B1 = 45000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
267
265
264
250
260
270
280
290
2100
Last modified: 2021-01-07T10:35:03+00:00