is 2 1783261 - 1
has 536816 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-L90EC4DEC2774E069double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26833.424769.1176%17832611961587100.97338.0467%34.398071.6027%2.4850%
PrimeNet2570.010863.1579%80001400000.00122.8125%0.012064.1941%1.0362%
GPU722610.172365.5738%80001300000.00121.4922%0.173466.0875%0.5137%
Difference+7+33.2524+3.5439%+1775261+196028710+0.9722+6.5545%+34.2246+5.5152%+5.5152%

Known prime factors (1 factor, 72.2 bits, 0.00404978% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
178326154935010319019362605532272.2181540296409752116
22 × 385074102438029
2020-05-114385074102438029716.941,650,3313,082,359

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:40:00Carsten Kossendeyleela950001615000---0.014--2.158%
2014-04-10T20:52:00ANONYMOUSManual testing100000100000---0.008--0.772%
2014-05-09T20:32:00Jocelyn LaroucheManual testing135993135993---0.011--0.924%
2014-09-19T20:39:00Jocelyn LaroucheManual testing171986171986---0.014--1.051%
2015-06-01T09:50:00mikrMSI247540086660000---0.556--7.333%
2018-07-02T12:39:36Jocelyn Larouchelow 4M178326117832610012---0.897--7.939%
2018-10-19T12:14:54Jocelyn Larouchelow 4M178326119615871012---0.973--8.047%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:51Mark RoseManual testing258260--0.065--
2010-04-21T13:12:00Architects Cubedm1_76l260261--0.086--
2016-02-23T16:28:51Mark RoseManual testing261262--0.172--
2010-10-16T22:16:00GrunwalderGIMPManual testing21263--0.895--
2016-02-23T16:28:51Mark RoseManual testing262263--0.550--
2015-05-14T21:29:00snme2pm1Manual testing263264--1.101--
2015-05-14T21:29:00snme2pm1Manual testing264265--2.095--
2015-09-12T12:52:00ramgeisManual testing265266--4.190--
2018-01-22T18:13:16TJAOIManual testing266267--8.381--
2019-08-06T10:06:01TJAOIManual testing267268--16.76--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.287 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.287 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024817.08
50000500000030.207


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-07-18T18:31:00MadPooManual testing90EC4DEC2774E0690.097


PRP results:
dateuseridcompidcofactorsres64PRP
2020-05-12T08:52:08kotenok2000shodan1
5493501031901936260553
2AB539F38EF20087no
2020-05-13T05:15:23Luigi Morelli9800X
5493501031901936260553
2AB539F38EF20087no


P-1 factor-bounds graph:
B1 = 1783261, B2 = 196158710 (P-1 stage 2)
B1 = 1783261, B2 = 178326100 (P-1 stage 2)
B1 = 2475400, B2 = 86660000 (P-1 stage 2)
B1 = 2475400 (P-1 stage 1)
B1 = 1783261 (P-1 stage 1)
B1 = 95000, B2 = 1615000 (P-1 stage 2)
B1 = 171986 (P-1 stage 1)
B1 = 135993 (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: 2020-11-06T10:16:03+00:00