is 2 1780283 - 1
has 535919 decimal digits
takes 0.097 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LCCC68F7250170376double-checked
PRP0371162DFD36DA35verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26833.480669.1176%31699521958311301.07518.4652%34.555671.7319%2.6143%
PrimeNet2570.010863.1579%80001400000.00122.8116%0.012064.1937%1.0358%
GPU722610.172565.5738%80001300000.00121.4917%0.173766.0873%0.5135%
Difference+7+33.3080+3.5439%+3161952+195701130+1.0739+6.9735%+34.3819+5.6446%+5.6446%

Known prime factors (1 factor, 76.7 bits, 0.00430778% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17802831219597615672937055618792476.69134252914162325233
3 × 347 × 7607 × 4325470759
2022-08-057607432547075917,03118.53834.624

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-09T16:50:00Carsten Kossendeyleela950001615000---0.014--2.158%
2012-11-23T07:05:00SergiosiManual testing200000010000000---0.192--4.781%
2018-01-14T10:12:26Jocelyn Larouchelow 4M31699521000000012---0.279--4.885%
2018-02-04T14:17:58Jocelyn Larouchelow 4M31699522000000012---0.321--5.710%
2018-02-08T12:52:28Jocelyn Larouchelow 4M31699524000000012---0.407--6.541%
2018-02-18T12:32:54Jocelyn Larouchelow 4M31699528000000012---0.579--7.378%
2018-06-19T11:36:54Jocelyn Larouchelow 4M316995217802830012---0.999--8.349%
2018-10-19T12:14:55Jocelyn Larouchelow 4M316995219583113012---1.075--8.465%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2022-08-05T12:41:27masserManual testing1600000160000019213P+12476.6910.191


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:51Mark RoseManual testing258260--0.065--
2010-04-18T22:56:00Architects Cubedm1_76l260261--0.086--
2016-02-23T16:28:51Mark RoseManual testing261262--0.173--
2010-10-04T14:39:00GrunwalderGIMPManual testing21263--0.896--
2016-02-23T16:28:51Mark RoseManual testing262263--0.551--
2015-05-14T12:16:00snme2pm1Manual testing263264--1.103--
2015-05-14T12:16:00snme2pm1Manual testing264265--2.099--
2015-09-12T12:52:00ramgeisManual testing265266--4.198--
2018-03-12T16:50:49TJAOIManual testing266267--8.395--
2019-08-06T10:06:02TJAOIManual testing267268--16.79--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.454 GHz-days
Estimated T-Level:24.786
DigitsB1CurvesCompleteFacMiss
2011000268 / 1002.6806.764%
2550000268 / 2800.95738.333%

New Calculation Method

Total ECM effort:18.454 GHz-days
Estimated T-Level:24.786
DigitsB1CompleteFacMiss
201100010.3080.003%
25500000.95438.530%
302500000.06094.162%
3510000000.00399.719%


ECM Summary

B1B2factorcurvesGHz-days
50000500000026818.45


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13T00:00:00ANONYMOUSv4_computersCCC68F72501703760.097
2015-07-18T18:31:00MadPooManual testingCCC68F72501703760.097


PRP results:
dateuseridcompidcofactorsres64PRP
2022-08-06T00:46:09Wentao HuangBiolake
121959761567293705561879
0371162DFD36DA35no


P-1 factor-bounds graph:
B1 = 3169952, B2 = 195831130 (P-1 stage 2)
B1 = 3169952, B2 = 178028300 (P-1 stage 2)
B1 = 3169952, B2 = 80000000 (P-1 stage 2)
B1 = 3169952, B2 = 40000000 (P-1 stage 2)
B1 = 3169952, B2 = 20000000 (P-1 stage 2)
B1 = 3169952, B2 = 10000000 (P-1 stage 2)
B1 = 3169952 (P-1 stage 1)
B1 = 2000000, B2 = 10000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 1600000 (P+1 stage 1)
B1 = 95000, B2 = 1615000 (P-1 stage 2)
B1 = 95000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-08-06T00:46:09+00:00