is 2 1884887 - 1
has 567408 decimal digits
takes 0.102 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L7464F7EECE553CE7double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26831.622569.1176%21499081884887000.96778.1892%32.590271.6467%2.5290%
PrimeNet2570.010263.1579%90001600000.00143.0335%0.011564.2755%1.1176%
GPU722610.163065.5738%100001500000.00141.6923%0.164466.1564%0.5826%
Difference+7+31.4595+3.5439%+2139908+188338700+0.9663+6.4968%+32.4259+5.4903%+5.4903%

Known prime factors (1 factor, 90.1 bits, 0.00478152% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
188488713512316749446736522119727192890.126358438377193082039457
33 × 2285478931 × 5808627361
2020-04-1922854789315808627361259,059,890194.88365.89

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-16T10:32:00markrtiny2750006000000---0.046--3.541%
2015-10-07T18:59:37Bruno Victal5820K-linux5000001500000012---0.101--4.616%
2016-09-18T02:26:36Jocelyn Larouchelow 4M5000003000000012---0.166--5.230%
2016-12-24T02:11:46Jocelyn Larouchelow 4M720000720000---0.057--2.079%
2016-12-28T01:38:24Jocelyn Larouchelow 4M864000864000---0.068--2.238%
2017-01-21T06:59:36Jocelyn Larouchelow 4M10368001036800---0.082--2.403%
2017-03-01T23:52:30Jocelyn Larouchelow 4M12441601244160012---0.146--4.887%
2017-05-06T15:58:38Jocelyn Larouchelow 4M14929921492992012---0.175--5.149%
2017-05-13T16:12:42Jocelyn Larouchelow 4M17915901791590012---0.210--5.418%
2017-05-29T03:23:27Jocelyn Larouchelow 4M21499083869834412---0.326--6.362%
2018-02-17T20:09:10Jocelyn Larouchelow 4M21499087739668812---0.492--7.158%
2018-06-11T11:42:56Jocelyn Larouchelow 4M214990818848870012---0.968--8.189%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:56Mark RoseManual testing258260--0.061--
2010-04-01T14:42:00Architects CubedManual testing260261--0.081--
2016-02-23T16:28:56Mark RoseManual testing261262--0.163--
2011-03-08T05:15:00GrunwalderGIMPManual testing21263--0.847--
2016-02-23T16:28:56Mark RoseManual testing262263--0.521--
2015-05-09T22:18:00snme2pm1Manual testing263264--1.042--
2015-05-09T22:18:00snme2pm1Manual testing264265--1.982--
2015-09-13T19:11:00ramgeisManual testing265266--3.965--
2018-05-28T14:40:33TJAOIManual testing266267--7.929--
2019-06-24T09:35:59TJAOIManual testing267268--15.86--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.636 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:18.636 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.4080.022%
25500000.76146.715%
302500000.04795.408%
3510000000.00299.784%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001087.485
50000500000030.208
50000660000014010.94


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-15T00:00:00ANONYMOUSv4_computers7464F7EECE553CE70.102
2015-06-27T00:56:00MadPooManual testing7464F7EECE553CE70.102


PRP results:
dateuseridcompidcofactorsres64PRP
2020-04-19T10:22:50CrypticCluecruncher
1351231674944673652211972719
FF9E40B8BA85C6BDno
2020-04-20T05:32:16Wentao Huangi5-5500u
1351231674944673652211972719
FF9E40B8BA85C6BDno


P-1 factor-bounds graph:
B1 = 2149908, B2 = 188488700 (P-1 stage 2)
B1 = 2149908, B2 = 77396688 (P-1 stage 2)
B1 = 2149908, B2 = 38698344 (P-1 stage 2)
B1 = 1791590, B2 = 17915900 (P-1 stage 2)
B1 = 1492992, B2 = 14929920 (P-1 stage 2)
B1 = 2149908 (P-1 stage 1)
B1 = 500000, B2 = 30000000 (P-1 stage 2)
B1 = 1244160, B2 = 12441600 (P-1 stage 2)
B1 = 1791590 (P-1 stage 1)
B1 = 1492992 (P-1 stage 1)
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)
104
105
106
107
108
109
1010
104
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: 2021-10-20T13:19:05+00:00