is 2 1779689 - 1
has 535740 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-L2AC760850079C591double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26833.491769.1176%17796891957657900.97148.0412%34.463171.6010%2.4833%
PrimeNet2570.010863.1579%80001400000.00122.8114%0.012064.1937%1.0358%
GPU722610.172665.5738%80001300000.00121.4916%0.173866.0873%0.5135%
Difference+7+33.3191+3.5439%+1771689+195635790+0.9702+6.5496%+34.2894+5.5137%+5.5137%

Known prime factors (1 factor, 84.7 bits, 0.00476044% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1779689318854371224679769392404732684.7218958148621042209324
22 × 3 × 19 × 263 × 149392112284741
2020-07-162631493921122847412,698,901640,2571,195,822

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:41:00Carsten Kossendeyleela950001615000---0.014--2.157%
2014-04-10T20:52:00ANONYMOUSManual testing100000100000---0.008--0.772%
2014-05-09T20:32:00Jocelyn LaroucheManual testing136065136065---0.011--0.924%
2014-09-19T20:39:00Jocelyn LaroucheManual testing172130172130---0.014--1.051%
2015-05-26T13:59:00mikrMSI247540086660000---0.556--7.332%
2018-07-04T11:51:47Jocelyn Larouchelow 4M177968917796890012---0.895--7.933%
2018-10-19T12:14:52Jocelyn Larouchelow 4M177968919576579012---0.971--8.041%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:51Mark RoseManual testing258260--0.065--
2010-04-22T12:47:00Architects Cubedm1_tt260261--0.086--
2016-02-23T16:28:51Mark RoseManual testing261262--0.173--
2010-10-04T14:39:00GrunwalderGIMPManual testing21263--0.897--
2016-02-23T16:28:51Mark RoseManual testing262263--0.552--
2015-05-08T09:00:00snme2pm1Manual testing263264--1.103--
2015-05-08T09:00:00snme2pm1Manual testing264265--2.099--
2015-09-11T08:33:00ramgeisManual testing265266--4.199--
2018-03-26T15:08:39TJAOIManual testing266267--8.398--
2019-06-17T12:15:02TJAOIManual testing267268--16.80--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.283 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.283 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)
1999-01-02T00:00:00ANONYMOUSv4_computers2AC760850079C5910.097
2015-07-18T18:31:00MadPooManual testing2AC760850079C5910.097


PRP results:
dateuseridcompidcofactorsres64PRP
2020-07-17T06:48:09kotenok2000shodan1
31885437122467976939240473
9FD9E16E31FD9062no
2020-07-24T03:10:58roemer2201ws-rebentrost-o
31885437122467976939240473
9FD9E16E31FD9062no


P-1 factor-bounds graph:
B1 = 1779689, B2 = 195765790 (P-1 stage 2)
B1 = 1779689, B2 = 177968900 (P-1 stage 2)
B1 = 2475400, B2 = 86660000 (P-1 stage 2)
B1 = 2475400 (P-1 stage 1)
B1 = 1779689 (P-1 stage 1)
B1 = 95000, B2 = 1615000 (P-1 stage 2)
B1 = 172130 (P-1 stage 1)
B1 = 136065 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
101
102
103
104
105
106
107
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
1014
1015
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
258
250
260
270
280
290
2100
Last modified: 2020-10-16T08:08:54+00:00