is 2 1905689 - 1
has 573670 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-L6B8D7AFFCA31288Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.592268.6567%1000000300000000.20296.2199%15.795270.6062%1.9495%
PrimeNet2570.010163.1579%90001600000.00143.0397%0.011464.2778%1.1199%
GPU722610.161265.5738%100001600000.00141.7284%0.162666.1688%0.5950%
Difference+6+15.4310+3.0829%+990000+29840000+0.2015+4.4915%+15.6325+4.4374%+4.4374%

Known prime factors (1 factor, 86.1 bits, 0.00451847% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1905689833833900231970024234903832686.10821877491559010153919
3 × 151883 × 48013913251231
2017-07-19151883480139132512319,467,728205,776384,332

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-06-01T14:08:00kurlyslice100000030000000---0.203--6.220%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2011-04-14T00:00:00GrunwalderGIMPv4_computers21256--0.005--
2011-04-14T00:00:00GrunwalderGIMPv4_computers256257--0.005--
2002-01-02T00:00:00Jocelyn Larouchev4_computers21258--0.020--
2011-04-14T00:00:00GrunwalderGIMPv4_computers257258--0.010--
2011-04-14T00:00:00GrunwalderGIMPv4_computers258259--0.020--
2011-04-14T00:00:00GrunwalderGIMPv4_computers259260--0.040--
2011-04-14T00:00:00GrunwalderGIMPv4_computers260261--0.081--
2009-05-25T16:29:00Architects Cubedi4l_1260261--0.081--
2011-02-08T18:08:00GrunwalderGIMPGWPrime02261262--0.161--
2011-02-08T21:56:00GrunwalderGIMPGWPrime02262263--0.515--
2015-05-17T05:14:00omylistManual testing263264--1.030--
2015-05-19T06:11:00omylistManual testing264265--1.961--
2015-08-31T08:30:00ramgeisManual testing265266--3.921--
2017-03-15T08:26:27Smok_bmvManual testing266267--7.843--


ECM factoring results:

Old Calculation Method

Total ECM effort:21.681 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:21.681 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110009.0750.011%
25500000.84842.816%
302500000.05594.623%
3510000000.00399.724%


ECM Summary

B1B2factorcurvesGHz-days
500005000000332.290
50000500000030.208
50000660000021516.83
2000003049655872.352


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-07-14T15:04:00MadPooManual testing6B8D7AFFCA31288B0.103


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-28T13:09:43alpertronManual testing
83383390023197002423490383
295B7C39BBAFFA__no
2017-10-20T03:20:20Oliver KruseThreadripper
83383390023197002423490383
295B7C39BBAFFA__no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
104
105
106
104
105
106
107
108
109
1010
1011
1012
1013
1014
TF factor-bounds graph:
267
266
265
264
263
262
261
260
259
258
257
256
250
260
270
280
290
2100
Last modified: 2022-01-18T14:07:36+00:00