is 2 3220831 - 1
has 969567 decimal digits
takes 0.274 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LB76C87396610B0DDdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26818.506167.6471%40000001500000001.47538.7663%19.981470.4832%2.8362%
PrimeNet2600.047763.3333%130002400000.00312.6606%0.050864.3089%0.9755%
GPU722641.105165.6250%160002600000.00361.6177%1.108766.1811%0.5561%
Difference+4+17.4010+2.0221%+3984000+149740000+1.4717+7.1486%+18.8727+4.3021%+4.3021%

Known prime factors (1 factor, 94.9 bits, 0.00294758% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
3220831379102993984744860873994379992994.9375885173639733734257929
2707 × 37339 × 2453707 × 23729339
2020-03-072453707237293391.998e+90.44590.6163

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-03T00:38:00Carsten Kossendeydurandal15000191250---0.003--0.784%
2011-09-04T18:44:00harleeP4_2600600001035000---0.014--1.919%
2014-06-09T10:17:00Jocelyn LaroucheManual testing7992879928---0.010--0.754%
2014-09-29T22:05:00Jocelyn LaroucheManual testing9985699856---0.012--0.861%
2015-12-15T05:38:31Squeeky_SquirrelP4_260015500039525006---0.045--3.181%
2016-04-19T21:44:55Jocelyn LaroucheManual testing435425129366336---0.138--4.710%
2020-03-07T09:45:16mikrMSI4000000150000000122994.9371.4750.5482.9518.766%
2021-01-18T13:43:04Jocelyn LaroucheManual testing46542532208316---0.076--3.513%
2022-01-02T21:52:47Jocelyn LaroucheManual testing32208313220831---0.397--3.814%
2022-01-03T11:28:02Jocelyn LaroucheManual testing3220831116701200-
skipped known factor: 37910299398474486087399437999
--1.161--8.315%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-05-27T00:00:00ANONYMOUSv4_computers21260--0.048--
2009-04-05T06:44:00S485122USB-Z260261--0.048--
2011-10-03T20:15:00markrManual testing21262--0.191--
2013-01-03T08:47:00dbaughManual testing262263--0.305--
2015-02-15T12:51:00VictordeHollanderManual testing263264--0.610--
2015-02-15T12:51:00VictordeHollanderManual testing264265--1.160--
2015-06-24T21:57:00ThaManual testing265266--2.320--
2021-02-21T11:36:41Jocelyn LaroucheManual testing265266--2.320--
2021-02-22T09:03:45Jocelyn LaroucheManual testing266267--4.640--
2017-03-20T00:06:22Gordon SpenceManual testing266267--4.640--
2018-12-24T09:14:04TJAOIManual testing267268--9.281--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.764 GHz-days
Estimated T-Level:0.750
DigitsB1CurvesCompleteFacMiss
201100015 / 1000.15086.006%
255000015 / 2800.05494.775%

New Calculation Method

Total ECM effort:1.764 GHz-days
Estimated T-Level:0.750
DigitsB1CompleteFacMiss
20110000.48461.639%
25500000.04495.721%
302500000.00399.731%


ECM Summary

B1B2factorcurvesGHz-days
500005000000151.764


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-07-04T00:00:00ANONYMOUSv4_computersB76C87396610B0DD0.274


PRP results:
dateuseridcompidcofactorsres64PRP
2020-03-07T10:07:32mikrV211
37910299398474486087399437999
2961C10EB997F875no
2020-03-08T00:32:31Niels_Mache_NextcloudSuperDry-X
37910299398474486087399437999
2961C10EB997F875no


P-1 factor-bounds graph:
B1 = 4000000, B2 = 150000000 (P-1 stage 2)
B1 = 3220831, B2 = 116701200 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
B1 = 3220831 (P-1 stage 1)
B1 = 435425, B2 = 12936633 (P-1 stage 2)
B1 = 465425, B2 = 3220831 (P-1 stage 2)
B1 = 465425 (P-1 stage 1)
B1 = 435425 (P-1 stage 1)
B1 = 155000, B2 = 3952500 (P-1 stage 2)
B1 = 155000 (P-1 stage 1)
B1 = 60000, B2 = 1035000 (P-1 stage 2)
B1 = 99856 (P-1 stage 1)
B1 = 79928 (P-1 stage 1)
B1 = 60000 (P-1 stage 1)
B1 = 15000, B2 = 191250 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-01-03T11:28:02+00:00