is 2 3558671 - 1
has 1071267 decimal digits
takes 0.374 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-
PRP4ED255849054ADE7verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual271134.341869.0141%35000035000000.07942.5605%134.421269.8075%0.7934%
PrimeNet2600.043263.3333%150003000000.00462.9691%0.047864.4220%1.0887%
GPU722641.000265.6250%200003600000.00591.9212%1.006166.2854%0.6604%
Difference+7+133.3416+3.3891%+330000+3140000+0.0736+0.6393%+133.4152+3.5221%+3.5221%

Known prime factors (1 factor, 74.8 bits, 0.00210326% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
3558671340001933008486223027592374.8484777091405871549
3 × 6653 × 239345228011
2021-07-0666532393452280111,468.11,985.93,709.1

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-07T17:51:00Carsten Kossendeyleela20000245000---0.005--0.603%
2011-12-17T21:37:00Squeeky_SquirrelP4_2600600001005000---0.017--1.308%
2014-08-11T01:34:00ANONYMOUSManual testing7803678036---0.012--0.485%
2014-11-19T23:20:00Jocelyn LaroucheManual testing9607296072---0.015--0.556%
2015-12-25T19:49:27Squeeky_SquirrelP4_260017500046812506---0.064--2.444%
2017-05-06T16:05:26Jocelyn Larouchelow 4M35000035000006---0.079--2.560%
2022-03-01T15:49:51Jocelyn LaroucheManual testing100000100000---0.015--0.570%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:33Mark RoseManual testing21260--0.043--
2009-03-16T06:10:00S485122USB-Z260261--0.043--
2011-06-25T06:14:00Grant McCrackenthumper261262--0.086--
2012-06-20T01:21:00GrunwalderGIMPManual testing21263--0.448--
2016-02-23T16:29:33Mark RoseManual testing262263--0.276--
2015-01-30T19:15:00VictordeHollanderManual testing263264--0.552--
2015-01-30T19:15:00VictordeHollanderManual testing264265--1.050--
2016-03-03T09:33:28ramgeisManual testing265266--2.100--
2017-01-16T05:00:24Gordon SpenceManual testing266267--4.200--
2019-02-04T14:28:15TJAOIManual testing267268--8.399--
2021-01-26T02:10:46axnManual testing268269--16.80--
2021-03-18T11:36:31-Anonymous-Manual testing269270--33.60--
2021-03-18T11:36:31-Anonymous-Manual testing270271--67.20--


ECM factoring results:

Old Calculation Method

Total ECM effort:4.289 GHz-days
Estimated T-Level:1.450
DigitsB1CurvesCompleteFacMiss
201100029 / 1000.29074.717%
255000029 / 2800.10490.144%

New Calculation Method

Total ECM effort:4.289 GHz-days
Estimated T-Level:1.450
DigitsB1CompleteFacMiss
20110000.93539.240%
25500000.08591.893%
302500000.00599.481%


ECM Summary

B1B2factorcurvesGHz-days
500005000000223.254
50000500000071.035


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-08-22T00:00:00ANONYMOUSv4_computers8499A512B4A4BC__0.374


PRP results:
dateuseridcompidcofactorsres64PRP
2021-07-07T15:32:06SRJ2877LTOS
34000193300848622302759
4ED255849054ADE7no


P-1 factor-bounds graph:
B1 = 350000, B2 = 3500000 (P-1 stage 2)
B1 = 175000, B2 = 4681250 (P-1 stage 2)
B1 = 350000 (P-1 stage 1)
B1 = 175000 (P-1 stage 1)
B1 = 60000, B2 = 1005000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 96072 (P-1 stage 1)
B1 = 78036 (P-1 stage 1)
B1 = 60000 (P-1 stage 1)
B1 = 20000, B2 = 245000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-01T15:49:51+00:00