is 2 3259561 - 1
has 981226 decimal digits
takes 0.342 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-
PRPC2E37971C0C657D6verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26936.626668.1159%40000001500000001.82068.1130%38.447270.7027%2.5867%
PrimeNet2600.047163.3333%140002600000.00422.7723%0.051364.3498%1.0165%
GPU722641.092065.6250%160002800000.00461.6558%1.096666.1942%0.5692%
Difference+5+35.5347+2.4909%+3984000+149720000+1.8159+6.4572%+37.3506+4.5085%+4.5085%

Known prime factors (1 factor, 73.9 bits, 0.00226673% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
3259561174464469986994199011832373.8852676195812672231
103 × 25982483618177
2021-05-2610325982483618177626.35215,582402,647

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-05T16:47:00Carsten Kossendeydurandal15000191250---0.004--0.670%
2011-09-14T12:40:00harleeP4_2600600001050000---0.017--1.696%
2014-06-11T02:12:00Jocelyn LaroucheManual testing7969179691---0.012--0.651%
2014-10-07T22:12:00Jocelyn LaroucheManual testing9938299382---0.015--0.746%
2016-01-19T03:09:25Jocelyn LaroucheManual testing41580041580006---0.094--3.335%
2020-09-12T12:21:47mikrMSI400000015000000012---1.821--8.113%
2022-04-02T19:48:44Jocelyn LaroucheManual testing1000000134316000---1.258--7.012%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-08-24T00:00:00ANONYMOUSv4_computers21260--0.047--
2009-04-04T07:04:00S485122USB-Z260261--0.047--
2011-09-22T06:35:00Grant McCrackenthumper261262--0.094--
2013-01-03T08:49:00dbaughManual testing262263--0.301--
2015-02-18T11:41:00VictordeHollanderManual testing263264--0.602--
2015-02-18T11:41:00VictordeHollanderManual testing264265--1.146--
2015-06-28T13:57:00ThaManual testing265266--2.293--
2017-03-30T02:15:55Gordon SpenceManual testing266267--4.585--
2019-01-07T14:44:13TJAOIManual testing267268--9.170--
2021-02-07T12:22:14ViliamFManual testing268269--18.34--


ECM factoring results:

Old Calculation Method

Total ECM effort:6.925 GHz-days
Estimated T-Level:2.100
DigitsB1CurvesCompleteFacMiss
201100042 / 1000.42065.566%
255000042 / 2800.15086.048%

New Calculation Method

Total ECM effort:6.925 GHz-days
Estimated T-Level:2.100
DigitsB1CompleteFacMiss
20110001.72617.791%
25500000.16584.765%
302500000.01198.918%


ECM Summary

B1B2factorcurvesGHz-days
500005000000294.218
50000645000030.493
50000670000050.838
800001128000051.377


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-09-14T00:00:00Wojciech Florekv4_computers3782703B0D9058__0.342


PRP results:
dateuseridcompidcofactorsres64PRP
2021-05-28T04:06:26kutenscanopus
17446446998699419901183
C2E37971C0C657D6no


P-1 factor-bounds graph:
B1 = 4000000, B2 = 150000000 (P-1 stage 2)
B1 = 1000000, B2 = 134316000 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
B1 = 415800, B2 = 4158000 (P-1 stage 2)
B1 = 415800 (P-1 stage 1)
B1 = 60000, B2 = 1050000 (P-1 stage 2)
B1 = 99382 (P-1 stage 1)
B1 = 79691 (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: 2022-04-02T19:48:44+00:00