is 2 1891949 - 1
has 569534 decimal digits
takes 0.103 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LB95AFD8FCD839A47double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26831.504569.1176%18919491891949000.95168.0996%32.456071.6190%2.5014%
PrimeNet2570.010163.1579%90001600000.00143.0356%0.011564.2763%1.1184%
GPU722610.162465.5738%100001600000.00141.7259%0.163866.1679%0.5942%
Difference+7+31.3421+3.5439%+1881949+189034900+0.9501+6.3737%+32.2923+5.4511%+5.4511%

Known prime factors (1 factor, 80.2 bits, 0.00423693% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
189194913512220708725520503694872580.161357097910903663907
3 × 29 × 599 × 6852376775539
2020-05-015996852376775539150,35229,36854,850

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-20T09:11:00markrtiny2750006000000---0.046--3.542%
2015-10-08T00:13:11Bruno Victal5820K-linux5000001500000012---0.101--4.618%
2016-09-22T11:43:16Jocelyn Larouchelow 4M5000001650000012---0.108--4.702%
2016-10-07T05:52:34Jocelyn Larouchelow 4M500000198000006---0.122--4.863%
2016-12-24T02:11:50Jocelyn Larouchelow 4M720000720000---0.057--2.080%
2016-12-28T01:38:22Jocelyn Larouchelow 4M864000864000---0.068--2.239%
2017-01-21T06:59:39Jocelyn Larouchelow 4M10368001036800---0.082--2.404%
2017-03-08T00:45:16Jocelyn Larouchelow 4M12441601244160012---0.146--4.889%
2017-04-30T01:08:18Jocelyn Larouchelow 4M14929921492992012---0.175--5.152%
2018-02-04T12:41:51Jocelyn Larouchelow 4M18919491492992012---0.205--5.240%
2018-02-04T16:40:55Jocelyn Larouchelow 4M18919492985984012---0.269--6.010%
2018-02-11T18:50:05Jocelyn Larouchelow 4M18919495971968012---0.397--6.788%
2018-03-01T21:20:07Jocelyn Larouchelow 4M189194911943936012---0.653--7.574%
2018-04-08T12:40:07Jocelyn Larouchelow 4M189194918919490012---0.952--8.100%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:57Mark RoseManual testing258260--0.061--
2010-04-11T14:32:00Architects CubedManual testing260261--0.081--
2016-02-23T16:28:57Mark RoseManual testing261262--0.162--
2011-03-08T05:18:00GrunwalderGIMPManual testing21263--0.844--
2016-02-23T16:28:57Mark RoseManual testing262263--0.519--
2015-05-11T11:29:00snme2pm1Manual testing263264--1.038--
2015-05-11T11:29:00snme2pm1Manual testing264265--1.975--
2015-09-13T19:11:00ramgeisManual testing265266--3.950--
2017-01-17T00:53:57ConductorManual testing266267--7.900--
2019-06-10T09:46:18TJAOIManual testing267268--15.80--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.592 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:18.592 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.3950.023%
25500000.76046.773%
302500000.04795.415%
3510000000.00299.785%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001157.973
50000500000020.139
50000660000013410.48


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02T00:00:00Ethan O'Connorv4_computersB95AFD8FCD839A470.103
2016-06-02T10:53:01MadPooManual testingB95AFD8FCD839A470.103


PRP results:
dateuseridcompidcofactorsres64PRP
2020-05-02T12:46:57Christoph ZengerManual testing
1351222070872552050369487
EB9CB0117DF2F92Eno
2020-05-02T20:30:00Klaus Nordmannno1
1351222070872552050369487
EB9CB0117DF2F92Eno


P-1 factor-bounds graph:
B1 = 1891949, B2 = 189194900 (P-1 stage 2)
B1 = 1891949, B2 = 119439360 (P-1 stage 2)
B1 = 1891949, B2 = 59719680 (P-1 stage 2)
B1 = 1891949, B2 = 29859840 (P-1 stage 2)
B1 = 1891949, B2 = 14929920 (P-1 stage 2)
B1 = 1492992, B2 = 14929920 (P-1 stage 2)
B1 = 1891949 (P-1 stage 1)
B1 = 1244160, B2 = 12441600 (P-1 stage 2)
B1 = 500000, B2 = 19800000 (P-1 stage 2)
B1 = 1492992 (P-1 stage 1)
B1 = 500000, B2 = 16500000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1244160 (P-1 stage 1)
B1 = 1036800 (P-1 stage 1)
B1 = 864000 (P-1 stage 1)
B1 = 720000 (P-1 stage 1)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
101
102
103
104
105
106
107
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
258
250
260
270
280
290
2100
Last modified: 2021-11-26T09:15:49+00:00