is 2 1941263 - 1
has 584379 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-LC4AB24CD9D4CF1C3double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26830.704269.1176%19412631941263000.97648.1700%31.680571.6407%2.5231%
PrimeNet2580.019863.7931%80001400000.00122.4646%0.021064.6855%0.8924%
GPU722620.316566.1290%8000900000.00101.1520%0.317566.5192%0.3902%
Difference+6+30.3877+2.9886%+1933263+194036300+0.9754+7.0180%+31.3631+5.1215%+5.1215%

Known prime factors:
No known factors for M1941263

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-12-11T05:39:00markrtiny2750006000000---0.046--3.555%
2015-10-08T12:24:39Bruno Victal5820K-linux5000001500000012---0.101--4.633%
2016-12-16T01:10:43Jocelyn Larouchelow 4M568903568903---0.045--1.892%
2016-12-16T17:41:55Jocelyn Larouchelow 4M682683682683---0.054--2.043%
2016-12-24T21:06:39Jocelyn Larouchelow 4M819219819219---0.064--2.200%
2017-01-04T23:07:22Jocelyn Larouchelow 4M983062983062---0.077--2.364%
2017-01-22T06:40:05Jocelyn Larouchelow 4M11796741179674---0.093--2.534%
2017-04-13T01:58:14Jocelyn Larouchelow 4M14156081415608012---0.166--5.089%
2018-02-02T17:56:16Jocelyn Larouchelow 4M19412632831216012---0.266--5.979%
2018-02-11T23:05:38Jocelyn Larouchelow 4M19412635662432012---0.387--6.761%
2018-02-28T12:59:32Jocelyn Larouchelow 4M194126311324864012---0.630--7.551%
2018-09-11T16:38:07Jocelyn Larouchelow 4M194126319412630012---0.976--8.170%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-21T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:59Mark RoseManual testing258260--0.059--
2010-01-27T19:29:00S485122USB-W260261--0.079--
2016-02-23T16:28:59Mark RoseManual testing261262--0.158--
2011-08-27T22:18:00GrunwalderGIMPManual testing21263--0.822--
2016-02-23T16:28:59Mark RoseManual testing262263--0.506--
2015-05-20T10:34:00monstManual testing263264--1.011--
2015-05-20T10:35:00monstManual testing264265--1.925--
2015-09-05T13:49:00ramgeisManual testing265266--3.849--
2017-11-17T15:40:08TJAOIManual testing266267--7.699--
2019-05-11T04:32:08chuenkitManual testing267268--15.40--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.339 GHz-days
Estimated T-Level:24.464
DigitsB1CurvesCompleteFacMiss
2011000250 / 1002.5008.106%
2550000250 / 2800.89340.883%

New Calculation Method

Total ECM effort:18.339 GHz-days
Estimated T-Level:24.464
DigitsB1CompleteFacMiss
20110009.8160.005%
25500000.91140.214%
302500000.05894.406%
3510000000.00399.731%


ECM Summary

B1B2factorcurvesGHz-days
500005000070.293
50000500000019713.70
50000545000070.504
500007500000463.842


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-29T00:00:00ANONYMOUSv4_computersC4AB24CD9D4CF1C30.105
2015-06-27T00:54:00MadPooManual testingC4AB24CD9D4CF1C30.105


PRP results:
No PRP results for M1941263


P-1 factor-bounds graph:
B1 = 1941263, B2 = 194126300 (P-1 stage 2)
B1 = 1941263, B2 = 113248640 (P-1 stage 2)
B1 = 1941263, B2 = 56624320 (P-1 stage 2)
B1 = 1941263, B2 = 28312160 (P-1 stage 2)
B1 = 1415608, B2 = 14156080 (P-1 stage 2)
B1 = 1941263 (P-1 stage 1)
B1 = 1415608 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1179674 (P-1 stage 1)
B1 = 983062 (P-1 stage 1)
B1 = 819219 (P-1 stage 1)
B1 = 682683 (P-1 stage 1)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 568903 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-04-14T10:50:07+00:00