is 2 1234787 - 1
has 371708 decimal digits
takes 0.038 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6AEA9D443EB81579double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual271387.174770.4225%5440898224484041908.219211.0000%395.394073.6761%3.2535%
PrimeNet2560.007862.5000%5500900000.00042.4304%0.008263.4114%0.9114%
GPU722600.124465.0000%5000300000.00030.8313%0.124765.2909%0.2909%
Difference+11+387.0503+5.4225%+54403982+2448374190+8.2190+10.1687%+395.2693+8.3851%+8.3851%

Known prime factors:
No known factors for M1234787

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-10-07T00:00:00Jocelyn Larouchev4_computers10001000---4.44667e-5--0.002%
2002-12-25T00:00:00ANONYMOUSv4_computers20000395000---0.002--0.563%
2013-11-10T04:38:00David Campeaui5-2500k174000048720000---0.191--4.768%
2016-08-03T14:48:44Bruno Victal5820K-factoring25000006250000012---0.257--5.171%
2016-08-27T10:53:00Bruno VictalManual testing25000006250000012---0.257--5.171%
2018-05-01T11:52:41Jocelyn Larouchelow 4M123478712347870012---0.351--5.355%
2018-10-13T20:38:14Jocelyn Larouchelow 4M123478713582657012---0.381--5.435%
2020-10-21T22:17:20krackerManual testing54408982244840419012---8.219--11.000%
2020-10-24T13:44:54krackerManual testing54408982244840419012---8.219--11.000%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-14T00:00:00ANONYMOUSv4_computers21257--0.016--
2003-05-26T00:00:00ANONYMOUSv4_computers21258--0.031--
2016-02-23T16:28:25Mark RoseManual testing258260--0.093--
2008-12-21T05:51:00Architects Cubedi4l_1260261--0.124--
2012-09-14T15:01:00AxelssonManual testing261262--0.249--
2012-10-26T08:03:00dbaughManual testing262263--0.795--
2013-04-09T09:12:00ramgeisManual testing263264--1.590--
2013-04-09T09:12:00ramgeisManual testing264265--3.026--
2014-02-04T13:02:00Never Odd Or EvenManual testing265266--6.052--
2014-02-04T13:02:00Never Odd Or EvenManual testing266267--12.10--
2014-02-04T13:02:00Never Odd Or EvenManual testing267268--24.21--
2014-02-04T13:02:00Never Odd Or EvenManual testing268269--48.41--
2014-02-04T13:02:00Never Odd Or EvenManual testing269270--96.83--
2014-04-01T16:52:00Never Odd Or EvenManual testing270271--193.7--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.775 GHz-days
Estimated T-Level:25.344
DigitsB1CurvesCompleteFacMiss
2011000325 / 1003.2503.815%
2550000325 / 2801.16131.261%
3025000044 / 6400.06993.351%

New Calculation Method

Total ECM effort:19.775 GHz-days
Estimated T-Level:25.344
DigitsB1CompleteFacMiss
201100015.2080.000%
25500001.66718.888%
302500000.13787.162%
3510000000.00999.076%


ECM Summary

B1B2factorcurvesGHz-days
50000500000028110.41
25000035000000449.368


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-11-12T20:09:37MadPooManual testing6AEA9D443EB815790.038


PRP results:
No PRP results for M1234787


P-1 factor-bounds graph:
B1 = 54408982, B2 = 2448404190 (P-1 stage 2)
B1 = 54408982 (P-1 stage 1)
B1 = 1234787, B2 = 135826570 (P-1 stage 2)
B1 = 1234787, B2 = 123478700 (P-1 stage 2)
B1 = 2500000, B2 = 62500000 (P-1 stage 2)
B1 = 1740000, B2 = 48720000 (P-1 stage 2)
B1 = 2500000 (P-1 stage 1)
B1 = 1740000 (P-1 stage 1)
B1 = 1234787 (P-1 stage 1)
B1 = 20000, B2 = 395000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 1000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-05-14T12:05:21+00:00