is 2 1732579 - 1
has 521559 decimal digits
takes 0.094 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF805A80BF4844931double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.150168.6567%36422001234567890.80008.6273%17.950171.3608%2.7041%
PrimeNet2570.011163.1579%80001400000.00122.7972%0.012364.1884%1.0305%
GPU722610.177365.5738%70001100000.00101.3458%0.178366.0371%0.4633%
Difference+6+16.9728+3.0829%+3635200+123346789+0.7990+7.2815%+17.7718+5.3237%+5.3237%

Known prime factors (1 factor, 87.8 bits, 0.00506859% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17325792726639070025612822013072632787.81778687294202042527989
13 × 139 × 1801 × 1710409 × 14136203
2015-09-2017104091413620319,848,4700.18780.2738

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-11T06:19:00Carsten Kossendeyleela950001543750---0.014--2.398%
2014-04-04T00:13:00Jocelyn LaroucheManual testing100000100000---0.008--0.886%
2014-05-06T10:52:00Jocelyn LaroucheManual testing137045137045---0.011--1.059%
2014-09-10T00:51:00Jocelyn LaroucheManual testing174090174090---0.014--1.203%
2014-12-02T21:55:00Jocelyn LaroucheManual testing211135211135---0.017--1.328%
2015-01-27T21:58:00Jocelyn LaroucheManual testing255472255472---0.020--1.459%
2015-01-29T22:02:00Jocelyn LaroucheManual testing281019281019---0.022--1.527%
2015-02-11T12:22:00Jocelyn LaroucheManual testing374051374051---0.029--1.743%
2015-02-22T09:50:00Jocelyn LaroucheManual testing411456411456---0.032--1.818%
2015-03-08T04:50:00Jocelyn LaroucheManual testing452601452601---0.036--1.896%
2015-03-15T18:55:00Jocelyn LaroucheManual testing497861497861---0.039--1.975%
2015-04-08T16:59:00Jocelyn LaroucheManual testing602411602411---0.047--2.139%
2015-05-01T17:20:00Jocelyn LaroucheManual testing728917728917---0.057--2.311%
2015-05-07T16:19:00Jocelyn LaroucheManual testing801808801808---0.063--2.400%
2015-05-22T00:28:00Jocelyn LaroucheManual testing881988881988---0.069--2.490%
2015-05-26T18:17:00Jocelyn LaroucheManual testing970186970186---0.076--2.582%
2015-06-08T13:43:00Jocelyn LaroucheManual testing10672041067204---0.084--2.676%
2015-06-25T21:15:00Jocelyn LaroucheManual testing11739241173924---0.092--2.772%
2015-07-07T18:13:00Jocelyn LaroucheManual testing12913161291316---0.102--2.870%
2015-07-21T01:20:00Jocelyn LaroucheManual testing14204471420447---0.112--2.970%
2015-07-27T01:26:00Jocelyn LaroucheManual testing15624911562491---0.123--3.071%
2015-09-16T07:26:00Jocelyn LaroucheManual testing17187401718740---0.135--3.174%
2015-09-20T17:19:00mikrMSI3642200123456789122787.8170.8000.1881.6008.627%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-21T00:00:00RonLavalleev4_computers21257--0.011--
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--
2010-04-24T12:42:00Architects Cubedm1_f2260261--0.089--
2010-11-18T02:51:00GrunwalderGIMPManual testing21263--0.921--
2015-05-05T00:55:00snme2pm1Manual testing263264--1.133--
2015-05-05T00:55:00snme2pm1Manual testing264265--2.157--
2015-09-03T11:06:00ramgeisManual testing265266--4.313--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.233 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.233 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025117.23


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-06T00:00:00RonLavalleev4_computersF805A80BF48449310.094
2015-07-18T19:04:00MadPooManual testingF805A80BF48449310.094


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:28:36alpertronManual testing
272663907002561282201307263
A50DAE6913E670__no
2017-10-19T08:55:37Oliver KruseThreadripper
272663907002561282201307263
A50DAE6913E670__no


P-1 factor-bounds graph:
B1 = 3642200, B2 = 123456789 (P-1 stage 2)
B1 = 3642200 (P-1 stage 1)
B1 = 1718740 (P-1 stage 1)
B1 = 1562491 (P-1 stage 1)
B1 = 1420447 (P-1 stage 1)
B1 = 1291316 (P-1 stage 1)
B1 = 1173924 (P-1 stage 1)
B1 = 1067204 (P-1 stage 1)
B1 = 970186 (P-1 stage 1)
B1 = 881988 (P-1 stage 1)
B1 = 801808 (P-1 stage 1)
B1 = 728917 (P-1 stage 1)
B1 = 602411 (P-1 stage 1)
B1 = 497861 (P-1 stage 1)
B1 = 452601 (P-1 stage 1)
B1 = 411456 (P-1 stage 1)
B1 = 374051 (P-1 stage 1)
B1 = 281019 (P-1 stage 1)
B1 = 255472 (P-1 stage 1)
B1 = 211135 (P-1 stage 1)
B1 = 174090 (P-1 stage 1)
B1 = 95000, B2 = 1543750 (P-1 stage 2)
B1 = 137045 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
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TF factor-bounds graph:
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2100
Last modified: 2020-05-18T10:37:35+00:00