is 2 1788373 - 1
has 538354 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-L9ED8A05FABFEDAB8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26833.329169.1176%17883731967210300.97618.0545%34.305271.6051%2.4874%
PrimeNet2570.010763.1579%80001400000.00122.8140%0.011964.1946%1.0367%
GPU722610.171865.5738%80001300000.00121.4931%0.172966.0878%0.5140%
Difference+7+33.1573+3.5439%+1780373+196591030+0.9750+6.5614%+34.1323+5.5173%+5.5173%

Known prime factors (1 factor, 78.0 bits, 0.00436416% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17883733123505119262294529239992478.04887328122244696563
3 × 29109374081565521
2020-01-2832910937408156552152,479124,755,500233,008,532

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-10T06:34:00Carsten Kossendeyleela950001615000---0.014--2.159%
2014-04-10T23:06:00ANONYMOUSManual testing100000100000---0.008--0.773%
2014-05-09T20:32:00Jocelyn LaroucheManual testing135890135890---0.011--0.924%
2014-09-19T20:39:00Jocelyn LaroucheManual testing171780171780---0.014--1.051%
2015-06-13T12:51:00mikrMSI247540086660000---0.556--7.336%
2018-07-02T01:21:11Jocelyn Larouchelow 4M178837317883730012---0.899--7.947%
2018-10-19T23:20:53Jocelyn Larouchelow 4M178837319672103012---0.976--8.055%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:51Mark RoseManual testing258260--0.064--
2010-04-20T22:46:00Architects Cubedm1_76l260261--0.086--
2016-02-23T16:28:52Mark RoseManual testing261262--0.172--
2010-10-27T20:37:00GrunwalderGIMPManual testing21263--0.892--
2016-02-23T16:28:51Mark RoseManual testing262263--0.549--
2015-05-15T01:55:00snme2pm1Manual testing263264--1.098--
2015-05-15T01:55:00snme2pm1Manual testing264265--2.089--
2015-09-12T12:52:00ramgeisManual testing265266--4.179--
2017-11-03T14:18:45TJAOIManual testing266267--8.357--
2019-06-24T09:36:04TJAOIManual testing267268--16.71--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.292 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.292 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025017.22
50000500000010.069


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00JShaftv4_computers9ED8A05FABFEDAB80.097
2015-07-18T18:31:00MadPooManual testing9ED8A05FABFEDAB80.097


PRP results:
dateuseridcompidcofactorsres64PRP
2020-01-28T11:19:02Christoph ZengerManual testing
312350511926229452923999
D8DC656F8F6CA1ABno
2020-01-30T02:40:43Justine V.Gible_Desktop_1
312350511926229452923999
D8DC656F8F6CA1ABno


P-1 factor-bounds graph:
B1 = 1788373, B2 = 196721030 (P-1 stage 2)
B1 = 1788373, B2 = 178837300 (P-1 stage 2)
B1 = 2475400, B2 = 86660000 (P-1 stage 2)
B1 = 2475400 (P-1 stage 1)
B1 = 1788373 (P-1 stage 1)
B1 = 95000, B2 = 1615000 (P-1 stage 2)
B1 = 171780 (P-1 stage 1)
B1 = 135890 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-11-27T10:33:19+00:00