is 2 1330487 - 1
has 400517 decimal digits
takes 0.051 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L53D2A74607E09421double-checked
PRPE75F81C71D9011__PRP-tested

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual271359.325870.4225%13304871463535700.51115.5957%359.836972.0776%1.6551%
PrimeNet2560.007262.5000%60001000000.00062.6055%0.007863.4771%0.9771%
GPU722600.115465.0000%5500400000.00040.9784%0.115865.3424%0.3424%
Difference+11+359.2104+5.4225%+1324987+146313570+0.5107+4.6173%+359.7210+6.7352%+1.3126%

Known prime factors:
No known factors for M1330487

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00ANONYMOUSv4_computers15000213750---0.001--0.414%
2014-04-25T23:37:00ANONYMOUSManual testing175000175000---0.010--0.670%
2014-05-04T22:20:00Aaron HavilandManual testing210000045000000---0.246--4.830%
2016-08-10T21:54:05Bruno Victal5820K-factoring25000006250000012---0.319--5.213%
2016-08-27T10:53:25Bruno VictalManual testing25000006250000012---0.319--5.213%
2018-04-23T10:51:59Jocelyn Larouchelow 4M133048713304870012---0.471--5.514%
2018-10-13T20:38:46Jocelyn Larouchelow 4M133048714635357012---0.511--5.596%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-03T00:00:00ANONYMOUSv4_computers21257--0.014--
2003-06-23T00:00:00ANONYMOUSv4_computers21258--0.029--
2016-02-23T16:28:27Mark RoseManual testing258260--0.087--
2009-02-15T18:59:00Sturle Sundescarpia.ifi260261--0.115--
2012-08-31T09:58:00lycornManual testing261262--0.231--
2012-08-31T09:58:00lycornManual testing262263--0.738--
2012-08-31T09:58:00lycornManual testing263264--1.476--
2013-10-19T08:51:00David CampeauManual testing264265--2.808--
2014-02-04T13:09:00Never Odd Or EvenManual testing265266--5.617--
2014-02-04T13:09:00Never Odd Or EvenManual testing266267--11.23--
2014-02-04T13:09:00Never Odd Or EvenManual testing267268--22.47--
2014-02-04T13:09:00Never Odd Or EvenManual testing268269--44.93--
2014-02-04T13:09:00Never Odd Or EvenManual testing269270--89.86--
2015-11-01T21:51:07ramgeisManual testing270271--179.7--


ECM factoring results:
Total ECM effort:25.150 GHz-days
Estimated T-Level:25.702
DigitsB1CompleteFacMiss
201100014.7850.000%
25500001.65719.071%
302500000.14086.896%
3510000000.01099.029%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025711.99
250000350000004913.16


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2010-03-17T00:00:00Bruce A Metcalfv4_computers53D2A74607E094210.051
2016-06-02T10:50:54MadPooManual testing53D2A74607E094210.051


PRP results:
dateuseridcompidcofactorsres64PRP
2020-11-06T14:21:42Ethan O'ConnorHighland2020E75F81C71D9011__no


P-1 factor-bounds graph:
B1 = 1330487, B2 = 146353570 (P-1 stage 2)
B1 = 1330487, B2 = 133048700 (P-1 stage 2)
B1 = 2500000, B2 = 62500000 (P-1 stage 2)
B1 = 2100000, B2 = 45000000 (P-1 stage 2)
B1 = 2500000 (P-1 stage 1)
B1 = 2100000 (P-1 stage 1)
B1 = 1330487 (P-1 stage 1)
B1 = 175000 (P-1 stage 1)
B1 = 15000, B2 = 213750 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-08-13T08:30:13+00:00