is 2 1685681 - 1
has 507441 decimal digits
takes 0.079 GHz-days to do one PRP test
Last-known PrimeNet details:
0 L-L tests remaining
ResidueStatus
L-LB421313CCE22E949double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.627268.6567%1000000400000000.21326.4454%17.840575.1021%11.9442%
PrimeNet2570.011463.1579%80001300000.00102.7269%0.012465.8848%2.7269%
GPU722610.182265.5738%7000900000.00081.2563%0.183066.8301%1.2563%
Difference+6+17.4450+3.0829%+993000+39910000+0.2125+5.1891%+17.6575+8.2720%+8.2720%

Known prime factors (1 factor, 67.0 bits, 0.00397724% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
16856811520957493098444222392167.04445114036792799
132 × 29 × 1361 × 6763459
2012-02-191361676345930.8270.02520.0470

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-01-25T02:46:00Jocelyn LaroucheManual testing5000050000---0.003--0.570%
2012-02-19T14:08:00AxonManual testing100000100000---0.007--0.881%
2012-02-19T14:08:00AxonManual testing200000200000---0.014--1.286%
2012-02-19T14:08:00AxonManual testing300000300000---0.020--1.568%
2012-02-19T14:08:00AxonManual testing400000400000---0.027--1.788%
2012-02-19T14:08:00AxonManual testing500000500000---0.034--1.971%
2012-02-19T14:09:00AxonManual testing600000600000---0.041--2.127%
2012-02-19T14:09:00AxonManual testing700000700000---0.048--2.265%
2012-02-19T14:09:00AxonManual testing800000800000---0.055--2.388%
2012-02-19T14:09:00AxonManual testing900000900000---0.061--2.500%
2012-02-19T14:09:00AxonManual testing10000001000000---0.068--2.602%
2012-02-19T14:09:00AxonManual testing100000016000000---0.124--5.464%
2012-02-19T14:10:00AxonManual testing100000024000000---0.154--5.896%
2012-02-19T14:10:00AxonManual testing100000032000000---0.183--6.205%
2012-02-19T14:10:00AxonManual testing100000040000000---0.213--6.445%
2016-03-17T19:18:42alpertronManual testing5000001500000012---0.088--5.019%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-07T00:00:00ANONYMOUSv4_computers?256--0.006--
1999-02-14T00:00:00Dry Creek Photov4_computers?257--0.011--
2003-03-16T00:00:00ANONYMOUSv4_computers?258--0.023--
2010-04-25T08:30:00For Researchm1_76l260261--0.091--
2010-09-13T18:09:00GrunwalderGIMPManual testing21263--0.947--


ECM factoring results:
Total ECM effort:14.906 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000025114.91


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-07T00:00:00ANONYMOUSv4_computersB421313CCE22E9490.079
1999-03-15T00:00:00Dry Creek Photov4_computersB421313CCE22E9490.079


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T00:52:45Oliver KruseGTX-3
152095749309844422239
1D8DA74A111886__no
2017-11-03T09:56:42kkmrkkblmbrbkold
152095749309844422239
1D8DA74A111886__no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 40000000 (stage 2)
B1 = 1000000, B2 = 32000000 (stage 2)
B1 = 1000000, B2 = 24000000 (stage 2)
B1 = 1000000, B2 = 16000000 (stage 2)
B1 = 500000, B2 = 15000000 (stage 2)
B1 = 1000000 (stage 1)
B1 = 900000 (stage 1)
B1 = 800000 (stage 1)
B1 = 700000 (stage 1)
B1 = 600000 (stage 1)
B1 = 500000 (stage 1)
B1 = 400000 (stage 1)
B1 = 300000 (stage 1)
B1 = 200000 (stage 1)
B1 = 100000 (stage 1)
B1 = 50000 (stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
TF factor-bounds graph:
267
263
261
258
257
256
250
260
270
280
290
2100
Last modified: 2020-01-27T11:17:07+00:00