is 2 8121577 - 1
has 2444839 decimal digits
takes 2.121 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LE2AB24D78FB67ED8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2687.339166.1765%21500053750000.18784.0543%7.526967.5478%1.3713%
PrimeNet2630.196563.4921%360009000000.03153.6144%0.228064.8116%1.3195%
GPU722673.658665.6716%5500012000000.04442.5730%3.703166.5549%0.8833%
Difference+1+3.6804+0.5048%+160000+4175000+0.1434+1.4814%+3.8238+0.9929%+0.9929%

Known prime factors (1 factor, 65.7 bits, 0.00080870% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
8121577590853377135872993212065.6793637553255580
22 × 3 × 5 × 27901 × 2172893
2012-09-222790121728931.37630.05480.0837

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-07-27T00:00:00ANONYMOUSv4_computers45000573750---0.028--1.792%
unknown2150005375000---0.188--4.054%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-08-24T00:00:00ANONYMOUSv4_computers21262--0.076--
1998-11-07T00:00:00ANONYMOUSv4_computers21263--0.197--
1998-11-21T00:00:00ANONYMOUSv4_computers21263--0.197--
2022-04-09T01:54:30LordJuliusManual testing21264--0.438--
2022-04-09T01:54:30LordJuliusManual testing264265--0.460--
2022-04-09T01:54:30LordJuliusManual testing26526665.679200.4784.3150.973
2022-04-09T01:54:30LordJuliusManual testing266267--1.840--
2022-03-15T07:28:45FlaukrotistManual testing267268--3.680--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CurvesCompleteFacMiss

New Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-12-08T00:00:00ANONYMOUSv4_computersE2AB24D78FB67ED82.121
2002-08-10T00:00:00ANONYMOUSv4_computersE2AB24D78FB67ED82.121


PRP results:
dateuseridcompidcofactorsres64PRP
2018-08-19T12:06:00Justine V.Gible_Desktop_1
59085337713587299321
6D0166F0B802FE__no
2020-02-19T03:19:00oodairacom2
59085337713587299321
6D0166F0B802FEF7no


P-1 factor-bounds graph:
B1 = 215000, B2 = 5375000 (P-1 stage 2)
B1 = 215000 (P-1 stage 1)
B1 = 45000, B2 = 573750 (P-1 stage 2)
B1 = 45000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
TF factor-bounds graph:
268
267
266
265
264
263
262
250
260
270
280
290
2100
Last modified: 2022-04-09T01:54:30+00:00