is 2 1820249 - 1
has 547950 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-L5203E8116333242Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.324168.6567%2780000917600000.60008.1250%16.924171.2033%2.5466%
PrimeNet2570.010563.1579%80001500000.00122.8762%0.011864.2176%1.0597%
GPU722610.168865.5738%90001300000.00121.5579%0.170066.1101%0.5363%
Difference+6+16.1553+3.0829%+2771000+91630000+0.5988+6.5671%+16.7541+5.0932%+5.0932%

Known prime factors (1 factor, 80.5 bits, 0.00442196% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
182024916987397425007568797538492580.491466622902278962076
22 × 3 × 2473 × 15723915024901
2016-08-26247315723915024901207,20167,389125,863

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:45:00Carsten Kossendeyleela1000001675000---0.015--2.489%
2014-06-09T10:16:00Jocelyn LaroucheManual testing139179139179---0.011--1.077%
2014-09-29T22:04:00Jocelyn LaroucheManual testing174440174440---0.014--1.215%
2015-05-31T09:16:00mikrMSI278000091760000---0.600--8.125%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:53Mark RoseManual testing258260--0.063--
2010-04-09T22:34:00Architects CubedManual testing260261--0.084--
2016-02-23T16:28:53Mark RoseManual testing261262--0.169--
2011-01-21T16:10:00GrunwalderGIMPManual testing21263--0.877--
2016-02-23T16:28:53Mark RoseManual testing262263--0.539--
2015-04-25T06:39:00snme2pm1Manual testing263264--1.079--
2015-04-25T06:39:00snme2pm1Manual testing264265--2.053--
2015-09-03T11:06:00ramgeisManual testing265266--4.105--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.232 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.232 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.5800.019%
25500000.77745.967%
302500000.04895.305%
3510000000.00299.779%


ECM Summary

B1B2factorcurvesGHz-days
500005000000332.278
50000500000010.069
50000660000021716.88


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computers5203E8116333242D0.099
2015-07-18T18:31:00MadPooManual testing5203E8116333242D0.099


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T23:08:52Oliver KruseGTX-0
1698739742500756879753849
C31D2757907081__no
2017-11-06T00:03:24kkmrkkblmbrbkc4.xlarge
1698739742500756879753849
C31D2757907081__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 = 174440 (P-1 stage 1)
B1 = 139179 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
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TF factor-bounds graph:
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2100
Last modified: 2021-03-26T16:50:19+00:00