is 2 1935221 - 1
has 582560 decimal digits
takes 0.105 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LEE5DA0281C648585double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26830.800069.1176%80000003200000001.96659.7464%32.766572.1276%3.0099%
PrimeNet2580.019863.7931%80001400000.00122.4631%0.021064.6849%0.8918%
GPU722620.317566.1290%8000900000.00101.1512%0.318466.5190%0.3899%
Difference+6+30.4826+2.9886%+7992000+319910000+1.9655+8.5952%+32.4480+5.6086%+5.6086%

Known prime factors:
No known factors for M1935221

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-11-20T04:38:00kurlyManual testing100000030000000---0.203--5.691%
2018-01-03T08:53:15Jocelyn Larouchelow 4M193522138704426---0.161--3.778%
2018-01-03T09:15:00Jocelyn Larouchelow 4M193522177408846---0.177--4.536%
2018-01-04T18:40:43Jocelyn Larouchelow 4M19352213096353612---0.277--6.076%
2018-01-31T15:06:01mikrS060800000032000000012---1.966--9.746%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-21T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:59Mark RoseManual testing258260--0.060--
2010-02-02T15:47:00S485122USB-W260261--0.079--
2016-02-23T16:28:59Mark RoseManual testing261262--0.159--
2011-08-27T22:21:00GrunwalderGIMPManual testing21263--0.825--
2016-02-23T16:28:59Mark RoseManual testing262263--0.507--
2015-05-14T06:40:00lycornManual testing263264--1.015--
2015-05-14T06:40:00lycornManual testing264265--1.931--
2015-09-04T17:59:00ramgeisManual testing265266--3.861--
2018-01-15T16:18:56TJAOIManual testing266267--7.723--
2019-05-10T04:32:10chuenkitManual testing267268--15.45--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.146 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:18.146 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110009.8140.005%
25500000.91340.135%
302500000.05894.390%
3510000000.00399.730%


ECM Summary

B1B2factorcurvesGHz-days
50000500000020113.97
500007500000504.174


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-01T00:00:00ANONYMOUSv4_computersEE5DA0281C6485850.105
2015-07-01T17:35:00MadPooManual testingEE5DA0281C6485850.105


PRP results:
No PRP results for M1935221


P-1 factor-bounds graph:
B1 = 8000000, B2 = 320000000 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 1935221, B2 = 30963536 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1935221, B2 = 7740884 (P-1 stage 2)
B1 = 1935221, B2 = 3870442 (P-1 stage 2)
B1 = 1935221 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-17T11:24:22+00:00