is 2 1732847 - 1
has 521639 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-LF14571DD22A49A75double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26834.397169.1176%18904251906131700.95758.0363%35.354671.5994%2.4818%
PrimeNet2570.011163.1579%80001400000.00122.7972%0.012364.1885%1.0306%
GPU722610.177365.5738%70001100000.00101.3458%0.178366.0371%0.4633%
Difference+7+34.2198+3.5439%+1883425+190503170+0.9565+6.6905%+35.1763+5.5624%+5.5624%

Known prime factors:
No known factors for M1732847

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-08T16:03:00Carsten Kossendeyleela950001543750---0.014--2.124%
2014-04-04T00:13:00Jocelyn LaroucheManual testing100000100000---0.008--0.768%
2014-05-06T10:52:00Jocelyn LaroucheManual testing137040137040---0.011--0.923%
2014-09-10T00:51:00Jocelyn LaroucheManual testing174080174080---0.014--1.053%
2014-12-02T21:55:00Jocelyn LaroucheManual testing211120211120---0.017--1.166%
2015-01-27T21:58:00Jocelyn LaroucheManual testing255455255455---0.020--1.284%
2015-01-29T22:02:00Jocelyn LaroucheManual testing281000281000---0.022--1.346%
2015-02-11T12:22:00Jocelyn LaroucheManual testing374014374014---0.029--1.543%
2015-02-22T09:50:00Jocelyn LaroucheManual testing411415411415---0.032--1.612%
2015-03-08T04:50:00Jocelyn LaroucheManual testing452556452556---0.036--1.683%
2015-03-15T18:55:00Jocelyn LaroucheManual testing497811497811---0.039--1.756%
2015-04-08T16:59:00Jocelyn LaroucheManual testing602351602351---0.047--1.906%
2015-05-01T17:20:00Jocelyn LaroucheManual testing728844728844---0.057--2.064%
2015-05-07T16:19:00Jocelyn LaroucheManual testing801728801728---0.063--2.146%
2015-05-22T00:28:00Jocelyn LaroucheManual testing881900881900---0.069--2.229%
2015-05-26T18:17:00Jocelyn LaroucheManual testing970090970090---0.076--2.314%
2015-06-08T13:43:00Jocelyn LaroucheManual testing10670991067099---0.084--2.401%
2015-06-25T21:15:00Jocelyn LaroucheManual testing11738081173808---0.092--2.490%
2015-07-07T18:13:00Jocelyn LaroucheManual testing12911881291188---0.102--2.581%
2015-07-21T01:20:00Jocelyn LaroucheManual testing14203061420306---0.112--2.673%
2015-07-27T01:26:00Jocelyn LaroucheManual testing15623361562336---0.123--2.767%
2015-09-16T07:26:00Jocelyn LaroucheManual testing17185691718569---0.135--2.863%
2015-09-21T23:35:00mikrMSI3642200123456789---0.800--7.966%
2018-10-03T11:47:41Jocelyn Larouchelow 4M18904251732847012---0.215--5.352%
2018-10-11T10:50:40Jocelyn Larouchelow 4M189042517328470012---0.883--7.928%
2018-10-17T22:59:54Jocelyn Larouchelow 4M189042519061317012---0.958--8.036%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-21T00:00:00ANONYMOUSv4_computers21257--0.011--
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:49Mark RoseManual testing258260--0.066--
2010-04-24T12:42:00Architects Cubedm1_f2260261--0.089--
2016-02-23T16:28:49Mark RoseManual testing261262--0.177--
2010-11-18T02:51:00GrunwalderGIMPManual testing21263--0.921--
2016-02-23T16:28:49Mark RoseManual testing262263--0.566--
2015-05-05T01:58:00snme2pm1Manual testing263264--1.133--
2015-05-05T01:58:00snme2pm1Manual testing264265--2.156--
2015-09-03T11:06:00ramgeisManual testing265266--4.312--
2018-05-28T14:40:35TJAOIManual testing266267--8.625--
2019-08-06T10:06:02TJAOIManual testing267268--17.25--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.675 GHz-days
Estimated T-Level:24.857
DigitsB1CurvesCompleteFacMiss
2011000272 / 1002.7206.498%
2550000272 / 2800.97137.788%

New Calculation Method

Total ECM effort:18.675 GHz-days
Estimated T-Level:24.857
DigitsB1CompleteFacMiss
20110008.7740.015%
25500000.79345.248%
302500000.04995.234%
3510000000.00299.777%


ECM Summary

B1B2factorcurvesGHz-days
50000500000027218.67


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-28T00:00:00ANONYMOUSv4_computersF14571DD22A49A750.094
2015-07-04T19:28:00MadPooManual testingF14571DD22A49A750.094


PRP results:
No PRP results for M1732847


P-1 factor-bounds graph:
B1 = 1890425, B2 = 190613170 (P-1 stage 2)
B1 = 1890425, B2 = 173284700 (P-1 stage 2)
B1 = 3642200, B2 = 123456789 (P-1 stage 2)
B1 = 3642200 (P-1 stage 1)
B1 = 1890425, B2 = 17328470 (P-1 stage 2)
B1 = 1890425 (P-1 stage 1)
B1 = 1718569 (P-1 stage 1)
B1 = 1562336 (P-1 stage 1)
B1 = 1420306 (P-1 stage 1)
B1 = 1291188 (P-1 stage 1)
B1 = 1173808 (P-1 stage 1)
B1 = 1067099 (P-1 stage 1)
B1 = 970090 (P-1 stage 1)
B1 = 881900 (P-1 stage 1)
B1 = 801728 (P-1 stage 1)
B1 = 728844 (P-1 stage 1)
B1 = 602351 (P-1 stage 1)
B1 = 497811 (P-1 stage 1)
B1 = 452556 (P-1 stage 1)
B1 = 411415 (P-1 stage 1)
B1 = 374014 (P-1 stage 1)
B1 = 281000 (P-1 stage 1)
B1 = 255455 (P-1 stage 1)
B1 = 211120 (P-1 stage 1)
B1 = 174080 (P-1 stage 1)
B1 = 95000, B2 = 1543750 (P-1 stage 2)
B1 = 137040 (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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Last modified: 2020-06-01T14:17:02+00:00