is 2 1816051 - 1
has 546686 decimal digits
takes 0.099 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6179A5ADF68CDE64double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26832.821169.1176%18160511816051000.91347.9882%33.734571.5846%2.4670%
PrimeNet2570.010663.1579%80001500000.00122.8750%0.011864.2171%1.0592%
GPU722610.169165.5738%90001300000.00121.5572%0.170466.1099%0.5361%
Difference+7+32.6520+3.5439%+1807051+181475100+0.9122+6.4310%+33.5642+5.4747%+5.4747%

Known prime factors (1 factor, 90.3 bits, 0.00497052% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
181605114897298244347880643328283132890.267410156384494374900356
22 × 13 × 3181 × 2479604771687513
2020-06-1831812479604771687513197,124,39910,626,96619,848,213

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-01-31T18:29:00henryzz10000010000000---0.050--3.241%
2014-05-13T21:11:00Jocelyn LaroucheManual testing135343135343---0.011--0.924%
2014-09-22T21:00:00Jocelyn LaroucheManual testing170686170686---0.013--1.050%
2015-05-24T16:28:00mikrMSI278000091760000---0.600--7.484%
2018-09-10T11:51:54Jocelyn Larouchelow 4M181605118160510012---0.913--7.988%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-16T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:53Mark RoseManual testing258260--0.063--
2010-04-17T18:46:00Architects Cubeda3_bu2260261--0.085--
2011-02-03T13:02:00Matteo2D261262--0.169--
2011-02-05T00:00:00ANONYMOUSv4_computers262263--0.541--
2011-02-04T16:50:00Matteo2D262263--0.541--
2015-04-23T05:08:00snme2pm1Manual testing263264--1.081--
2015-04-23T05:08:00snme2pm1Manual testing264265--2.057--
2015-09-02T13:37:00ramgeisManual testing265266--4.115--
2018-03-19T15:07:58TJAOIManual testing266267--8.230--
2019-06-24T09:36:04TJAOIManual testing267268--16.46--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.321 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.321 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024917.18
50000500000020.138


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computers6179A5ADF68CDE640.099
2015-07-18T18:31:00MadPooManual testing6179A5ADF68CDE640.099


PRP results:
dateuseridcompidcofactorsres64PRP
2020-06-18T12:29:55mnd9mnd
1489729824434788064332828313
F6EE01138C83BEC3no
2020-06-18T14:07:33CrypticCluecruncher
1489729824434788064332828313
F6EE01138C83BEC3no


P-1 factor-bounds graph:
B1 = 1816051, B2 = 181605100 (P-1 stage 2)
B1 = 2780000, B2 = 91760000 (P-1 stage 2)
B1 = 2780000 (P-1 stage 1)
B1 = 1816051 (P-1 stage 1)
B1 = 100000, B2 = 10000000 (P-1 stage 2)
B1 = 170686 (P-1 stage 1)
B1 = 135343 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-03-05T18:09:51+00:00