is 2 1950527 - 1
has 587168 decimal digits
takes 0.106 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L2C4000F1D912B658double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26830.558369.1176%19505271950527000.98108.1830%31.539471.6447%2.5271%
PrimeNet2580.019763.7931%80001400000.00122.4669%0.020964.6863%0.8932%
GPU722620.315066.1290%8000900000.00101.1532%0.316066.5196%0.3906%
Difference+6+30.2434+2.9886%+1942527+194962700+0.9800+7.0298%+31.2234+5.1251%+5.1251%

Known prime factors:
No known factors for M1950527

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-05-13T05:15:00kurlyhex100000030000000---0.203--5.696%
2018-01-19T19:39:55Jocelyn Larouchelow 4M19505273000000012---0.274--6.049%
2018-02-12T11:12:49Jocelyn Larouchelow 4M19505276000000012---0.402--6.833%
2018-03-02T23:08:38Jocelyn Larouchelow 4M195052712000000012---0.659--7.625%
2018-05-10T11:54:29Jocelyn Larouchelow 4M195052719505270012---0.981--8.183%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-21T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:59Mark RoseManual testing258260--0.059--
2010-01-19T14:05:00S485122USB-W260261--0.079--
2016-02-23T16:28:59Mark RoseManual testing261262--0.157--
2011-08-27T22:18:00GrunwalderGIMPManual testing21263--0.818--
2016-02-23T16:28:59Mark RoseManual testing262263--0.503--
2015-04-26T09:03:00lycornManual testing263264--1.007--
2015-04-26T09:04:00lycornManual testing264265--1.916--
2015-09-06T20:47:00ramgeisManual testing265266--3.831--
2018-02-19T12:08:12TJAOIManual testing266267--7.662--
2019-05-12T16:32:12chuenkitManual testing267268--15.32--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.122 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:18.122 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110009.8040.006%
25500000.91240.182%
302500000.05894.398%
3510000000.00399.730%


ECM Summary

B1B2factorcurvesGHz-days
50000500000020414.19
500007500000473.928


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02T00:00:00ANONYMOUSv4_computers2C4000F1D912B6580.106
2015-06-27T00:56:00MadPooManual testing2C4000F1D912B6580.106


PRP results:
No PRP results for M1950527


P-1 factor-bounds graph:
B1 = 1950527, B2 = 195052700 (P-1 stage 2)
B1 = 1950527, B2 = 120000000 (P-1 stage 2)
B1 = 1950527, B2 = 60000000 (P-1 stage 2)
B1 = 1950527, B2 = 30000000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1950527 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-04-28T10:18:15+00:00