is 2 1920283 - 1
has 578063 decimal digits
takes 0.104 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6BEE46E2D3B45812double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26831.039669.1176%80000003200000001.96659.7398%33.006172.1255%3.0079%
PrimeNet2570.010063.1579%90001700000.00143.0929%0.011464.2974%1.1395%
GPU722610.160065.5738%100001700000.00151.7616%0.161466.1802%0.6064%
Difference+7+30.8797+3.5439%+7990000+319830000+1.9650+7.9782%+32.8446+5.9453%+5.9453%

Known prime factors (1 factor, 80.9 bits, 0.00421484% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
192028323141991409664191818482092580.937602567210397222488
23 × 11 × 3227911 × 2121295991
2019-12-1132279112121295991245,3169.331416.980

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-08-31T13:11:00kurlyhex100000030000000---0.203--5.686%
2018-01-07T14:31:39mikrS064800000032000000012---1.966--9.740%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2002-12-25T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:58Mark RoseManual testing258260--0.060--
2009-06-02T23:43:00Architects Cubedi4l_1260261--0.080--
2016-02-23T16:28:58Mark RoseManual testing261262--0.160--
2011-08-27T22:20:00GrunwalderGIMPManual testing21263--0.831--
2016-02-23T16:28:58Mark RoseManual testing262263--0.511--
2015-05-17T04:10:00snme2pm1Manual testing263264--1.022--
2015-05-17T04:10:00snme2pm1Manual testing264265--1.946--
2015-09-02T13:37:00ramgeisManual testing265266--3.891--
2018-06-04T13:10:06TJAOIManual testing266267--7.783--
2019-04-28T16:32:11chuenkitManual testing267268--15.57--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.136 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:20.136 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.7670.016%
25500000.78045.836%
302500000.04895.281%
3510000000.00299.778%


ECM Summary

B1B2factorcurvesGHz-days
500005000000543.750
50000500000030.208
50000750000019416.18


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-06-15T00:00:00ANONYMOUSv4_computers6BEE46E2D3B458120.104
2015-07-10T01:00:00MadPooManual testing6BEE46E2D3B458120.104


PRP results:
dateuseridcompidcofactorsres64PRP
2019-12-12T15:16:28Niels_Mache_NextcloudSuperDry-X
2314199140966419181848209
4E28B112E9981C99no
2019-12-17T02:25:25Chang Chia-Tcheexbpc13
2314199140966419181848209
4E28B112E9981C99no


P-1 factor-bounds graph:
B1 = 8000000, B2 = 320000000 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
105
106
107
105
106
107
108
109
1010
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
258
250
260
270
280
290
2100
Last modified: 2022-02-10T10:47:09+00:00