is 2 3255437 - 1
has 979985 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-L7B41A2EFBA6FD1E3double-checked
PRPF5067A795B39F998verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26936.673068.1159%40000001500000001.82068.1120%38.493670.7024%2.5864%
PrimeNet2600.047263.3333%140002600000.00422.7717%0.051464.3496%1.0163%
GPU722641.093365.6250%160002800000.00461.6554%1.098066.1940%0.5690%
Difference+5+35.5797+2.4909%+3984000+149720000+1.8159+6.4566%+37.3956+4.5083%+4.5083%

Known prime factors (1 factor, 84.1 bits, 0.00258312% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
3255437206154996127588780910954872684.0923166318318056666139
17467 × 181274306867617
2021-04-03174671812743068676172,021,1771,504,0682,809,180

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-05T05:40:00Carsten Kossendeydurandal15000191250---0.004--0.670%
2011-09-12T23:46:00harleeP4_2600600001050000---0.017--1.696%
2014-06-11T02:10:00Jocelyn LaroucheManual testing7971679716---0.012--0.651%
2014-10-07T22:12:00Jocelyn LaroucheManual testing9943299432---0.015--0.746%
2016-01-17T13:12:29Jocelyn LaroucheManual testing41580041580006---0.094--3.334%
2020-08-12T01:26:37mikrMSI400000015000000012---1.821--8.112%
2022-03-24T08:47:00Jocelyn LaroucheManual testing1000000134316000---1.258--7.011%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-08-24T00:00:00ANONYMOUSv4_computers21260--0.047--
2009-04-04T07:03:00S485122USB-Z260261--0.047--
2011-09-18T20:19:00markrManual testing21262--0.189--
2013-01-03T08:49:00dbaughManual testing262263--0.302--
2015-02-18T11:41:00VictordeHollanderManual testing263264--0.603--
2015-02-18T11:41:00VictordeHollanderManual testing264265--1.148--
2015-06-28T13:57:00ThaManual testing265266--2.295--
2017-03-30T02:15:54Gordon SpenceManual testing266267--4.591--
2019-01-07T14:44:15TJAOIManual testing267268--9.182--
2021-02-07T12:22:03ViliamFManual testing268269--18.36--


ECM factoring results:

Old Calculation Method

Total ECM effort:5.795 GHz-days
Estimated T-Level:1.750
DigitsB1CurvesCompleteFacMiss
201100035 / 1000.35070.345%
255000035 / 2800.12588.230%

New Calculation Method

Total ECM effort:5.795 GHz-days
Estimated T-Level:1.750
DigitsB1CompleteFacMiss
20110001.21329.745%
25500000.11389.340%
302500000.00799.278%


ECM Summary

B1B2factorcurvesGHz-days
500005000000223.199
50000500000050.727
50000645000030.493
800001128000051.376


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-02-08T00:00:00ANONYMOUSv4_computers7B41A2EFBA6FD1E30.342
1999-06-26T00:00:00ANONYMOUSv4_computers7B41A2EFBA6FD1E30.342


PRP results:
dateuseridcompidcofactorsres64PRP
2021-04-03T16:34:10Kirill Frolovshodan1
20615499612758878091095487
F5067A795B39F998no
2021-04-04T00:29:21XZTN4640G1
20615499612758878091095487
F5067A795B39F998no


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 = 99432 (P-1 stage 1)
B1 = 79716 (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: 2022-03-24T08:47:00+00:00