is 2 1824749 - 1
has 549305 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-LA0734F972F8E12CBdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.283868.6567%2780000917600000.60008.1270%16.883971.2040%2.5473%
PrimeNet2570.010563.1579%80001500000.00122.8775%0.011864.2180%1.0601%
GPU722610.168365.5738%90001400000.00131.5937%0.169666.1224%0.5486%
Difference+6+16.1155+3.0829%+2771000+91620000+0.5988+6.5333%+16.7143+5.0816%+5.0816%

Known prime factors (1 factor, 76.5 bits, 0.00419336% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18247491082192125175324908615932476.51829653177647318204
22 × 3 × 72 × 41 × 5011 × 245462783
2017-11-29501124546278314,6391.05241.9648

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:39:00Carsten Kossendeyleela1000001675000---0.015--2.490%
2014-05-19T21:00:00Jocelyn LaroucheManual testing135174135174---0.011--1.060%
2014-09-22T21:00:00Jocelyn LaroucheManual testing170348170348---0.013--1.200%
2015-06-12T16:28:00mikrMSI278000091760000---0.600--8.127%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-16T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:53Mark RoseManual testing258260--0.063--
2010-04-11T14:32:00Architects CubedManual testing260261--0.084--
2016-02-23T16:28:53Mark RoseManual testing261262--0.168--
2011-01-21T16:10:00GrunwalderGIMPManual testing21263--0.875--
2016-02-23T16:28:53Mark RoseManual testing262263--0.538--
2015-04-25T21:24:00snme2pm1Manual testing263264--1.076--
2015-04-25T21:24:00snme2pm1Manual testing264265--2.048--
2015-09-03T11:06:00ramgeisManual testing265266--4.095--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.123 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.123 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.5510.019%
25500000.77546.092%
302500000.04895.323%
3510000000.00299.780%


ECM Summary

B1B2factorcurvesGHz-days
500005000000453.107
50000500000020.138
50000660000020415.88


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-21T00:00:00ANONYMOUSv4_computersA0734F972F8E12CB0.099
2015-07-18T18:31:00MadPooManual testingA0734F972F8E12CB0.099


PRP results:
dateuseridcompidcofactorsres64PRP
2017-12-01T05:46:25kkmrkkblmbrbkc4.xlarge
108219212517532490861593
7F82A15798B7C9__no
2017-12-01T23:58:45Oliver KruseGTX-3
108219212517532490861593
7F82A15798B7C9__no


P-1 factor-bounds graph:
B1 = 2780000, B2 = 91760000 (P-1 stage 2)
B1 = 2780000 (P-1 stage 1)
B1 = 100000, B2 = 1675000 (P-1 stage 2)
B1 = 170348 (P-1 stage 1)
B1 = 135174 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
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TF factor-bounds graph:
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265
264
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2100
Last modified: 2021-04-09T16:12:03+00:00