is 2 2512847 - 1
has 756443 decimal digits
takes 0.174 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6D07C4DCF3F332C9double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26947.510668.1159%32000001120000000.91807.4326%48.428670.4857%2.3698%
PrimeNet2590.030662.7119%110001900000.00212.6415%0.032663.6968%0.9850%
GPU722630.635165.0794%110001700000.00201.4089%0.637165.5714%0.4920%
Difference+6+46.8754+3.0366%+3189000+111830000+0.9160+6.0236%+47.7915+4.9144%+4.9144%

Known prime factors:
No known factors for M2512847

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-23T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.190%
2003-10-31T00:00:00Team Prime Ribv4_computers15000236250---0.003--0.679%
2010-12-19T21:41:00Jocelyn LaroucheManual testing2000020000---0.002--0.221%
2011-01-01T13:18:00Jocelyn LaroucheManual testing3000030000---0.003--0.309%
2011-01-06T01:05:00Jocelyn LaroucheManual testing5000050000---0.005--0.453%
2011-10-05T12:40:00markrtiny1700003952500---0.038--2.791%
2016-03-07T10:42:58mikrMSI320000011200000012---0.918--7.433%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-15T00:00:00ANONYMOUSv4_computers21259--0.031--
2016-02-23T16:29:15Mark RoseManual testing259260--0.031--
2009-01-30T18:14:00Sturle Sundeherrick.ifi260261--0.061--
2012-06-13T00:43:00Sebastian HornbostelManual testing261262--0.122--
2013-01-14T11:53:00dbaughManual testing262263--0.391--
2015-02-18T11:36:00VictordeHollanderManual testing263264--0.781--
2015-02-18T11:36:00VictordeHollanderManual testing264265--1.487--
2015-11-05T09:47:22ramgeisManual testing265266--2.974--
2017-07-31T07:56:50Gordon SpenceManual testing266267--5.948--
2019-05-06T12:23:26TJAOIManual testing267268--11.90--
2021-06-03T11:39:34TJAOIManual testing268269--23.79--


ECM factoring results:

Old Calculation Method

Total ECM effort:15.273 GHz-days
Estimated T-Level:22.875
DigitsB1CurvesCompleteFacMiss
2011000161 / 1001.61019.827%
2550000161 / 2800.57556.213%

New Calculation Method

Total ECM effort:15.273 GHz-days
Estimated T-Level:22.875
DigitsB1CompleteFacMiss
20110006.2780.188%
25500000.58055.966%
302500000.03796.402%
3510000000.00299.829%


ECM Summary

B1B2factorcurvesGHz-days
500005000030.161
50000500000014012.88
500006750000141.479
50000700000070.753


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-26T00:00:00ANONYMOUSv4_computers6D07C4DCF3F332C90.174
2018-06-04T14:14:34kkmrkkblmbrbkold6D07C4DCF3F332C90.174


PRP results:
No PRP results for M2512847


P-1 factor-bounds graph:
B1 = 3200000, B2 = 112000000 (P-1 stage 2)
B1 = 3200000 (P-1 stage 1)
B1 = 170000, B2 = 3952500 (P-1 stage 2)
B1 = 170000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 236250 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-06-24T19:40:13+00:00