is 2 1785851 - 1
has 537595 decimal digits
takes 0.097 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L430C27025C93F466double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.638568.6567%2475400866600000.55557.9674%17.194071.1540%2.4972%
PrimeNet2570.010863.1579%80001400000.00122.8133%0.011964.1944%1.0365%
GPU722610.172065.5738%80001300000.00121.4927%0.173266.0876%0.5139%
Difference+6+16.4665+3.0829%+2467400+86530000+0.5544+6.4747%+17.0209+5.0663%+5.0663%

Known prime factors (2 factors, 182.4 bits, 0.01021317% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
178585110663684618016119886787457912889.785298560311527000849645
5 × 11 × 31 × 349 × 491 × 82189 × 12433319
2015-06-08821891243331996,110,9980.05940.0995
178585175433700550355715837420198892892.6072111981922074006057544
23 × 3 × 7 × 977 × 1097 × 150571 × 77900167
2015-06-0815057177900167571,833,8480.34510.6236

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
178585180440119223886236411670749928349024391009293614970
37199
55182.392
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-11T06:19:00Carsten Kossendeyleela950001615000---0.014--2.436%
2014-04-10T20:52:00ANONYMOUSManual testing100000100000---0.008--0.891%
2014-05-09T20:32:00Jocelyn LaroucheManual testing135940135940---0.011--1.060%
2014-09-19T20:39:00Jocelyn LaroucheManual testing171880171880---0.014--1.201%
2015-06-08T18:50:00mikrMSI2475400866600001255182.3920.5560.1941.1117.967%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2022-03-08T23:06:26LordJuliusManual testing258260--0.065--
2010-04-19T13:16:00Architects Cubedm1_76l260261--0.086--
2010-10-16T22:17:00GrunwalderGIMPManual testing21263--0.894--
2015-05-14T21:29:00snme2pm1Manual testing263264--1.099--
2015-05-14T21:29:00snme2pm1Manual testing264265--2.092--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.771 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:17.771 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.3230.024%
25500000.75247.133%
302500000.04695.474%
3510000000.00299.788%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025817.77


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02T00:00:00ANONYMOUSv4_computers430C27025C93F4660.097
1999-04-23T00:00:00ANONYMOUSv4_computers430C27025C93F4660.097


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T15:11:11Oliver KruseGTX-3
1066368461801611988678745791
7543370055035571583742019889
778023415F35893Dno
2017-10-05T21:44:06Oliver KruseManual testing
1066368461801611988678745791
7543370055035571583742019889
778023415F3589__no
2017-11-11T01:54:11kkmrkkblmbrbkc4.xlarge
1066368461801611988678745791
7543370055035571583742019889
778023415F3589__no


P-1 factor-bounds graph:
B1 = 2475400, B2 = 86660000 (P-1 stage 2)
B1 = 2475400 (P-1 stage 1)
B1 = 95000, B2 = 1615000 (P-1 stage 2)
B1 = 171880 (P-1 stage 1)
B1 = 135940 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
TF factor-bounds graph:
267
265
264
263
261
260
258
250
260
270
280
290
2100
Last modified: 2022-03-08T23:06:26+00:00