is 2 1952311 - 1
has 587705 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-L80627B0D25849DE5double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26830.530469.1176%19523112440388751.19118.4429%31.721571.7250%2.6074%
PrimeNet2580.019763.7931%80001400000.00122.4673%0.020964.6864%0.8933%
GPU722620.314766.1290%8000900000.00101.1534%0.315766.5197%0.3907%
Difference+6+30.2157+2.9886%+1944311+243948875+1.1901+7.2895%+31.4059+5.2053%+5.2053%

Known prime factors (1 factor, 81.2 bits, 0.00415695% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
195231126951758076918581400955132581.157690252681998886996
22 × 3 × 11 × 23 × 229 × 992820767959
2020-03-18229992820767959379,8564,255.07,947.1

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-09T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.219%
2003-02-24T00:00:00ANONYMOUSv4_computers4096409600---0.002--0.451%
2011-05-08T03:24:00kurlykk100000030000000---0.203--5.697%
2018-01-23T13:04:01Jocelyn Larouchelow 4M19523113000000012---0.274--6.050%
2018-02-12T15:08:33Jocelyn Larouchelow 4M19523116000000012---0.402--6.834%
2018-03-02T23:08:39Jocelyn Larouchelow 4M195231112000000012---0.659--7.626%
2018-05-10T11:54:30Jocelyn Larouchelow 4M195231119523110012---0.982--8.185%
2018-11-26T12:54:02Jocelyn LaroucheManual testing195231124403887512---1.191--8.443%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1997-12-30T00:00:00ANONYMOUSv4_computers21257--0.010--
1998-02-19T00:00:00ANONYMOUSv4_computers21257--0.010--
1998-02-24T00:00:00ANONYMOUSv4_computers21257--0.010--
1998-03-03T00:00:00ANONYMOUSv4_computers21257--0.010--
1998-03-17T00:00:00ANONYMOUSv4_computers21257--0.010--
1998-12-27T00:00:00garyfuv4_computers21258--0.020--
2003-03-27T00:00:00ANONYMOUSv4_computers21259--0.039--
2016-02-23T16:28:59Mark RoseManual testing259260--0.039--
2010-01-18T00:15:00S485122USB-W260261--0.079--
2016-02-23T16:29:00Mark RoseManual testing261262--0.157--
2011-08-27T22:19:00GrunwalderGIMPManual testing21263--0.818--
2016-02-23T16:28:59Mark RoseManual testing262263--0.503--
2015-04-23T21:39:00lycornManual testing263264--1.006--
2015-04-23T21:40:00lycornManual testing264265--1.914--
2015-09-06T20:47:00ramgeisManual testing265266--3.828--
2018-02-12T20:05:02TJAOIManual testing266267--7.655--
2019-05-23T07:38:42chuenkitManual testing267268--15.31--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.665 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.665 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.6390.018%
25500000.77146.260%
302500000.04895.341%
3510000000.00299.781%


ECM Summary

B1B2factorcurvesGHz-days
500005000000936.472
50000500000010.070
50000750000015713.12


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02T00:00:00garyfuv4_computers80627B0D25849DE50.106
2015-06-27T00:56:00MadPooManual testing80627B0D25849DE50.106


PRP results:
dateuseridcompidcofactorsres64PRP
2020-03-19T09:14:19ANONYMOUSdory
2695175807691858140095513
E474489EB6EE703Eno
2020-03-19T14:57:23Niels_Mache_NextcloudSuperDry-X
2695175807691858140095513
E474489EB6EE703Eno


P-1 factor-bounds graph:
B1 = 1952311, B2 = 244038875 (P-1 stage 2)
B1 = 1952311, B2 = 195231100 (P-1 stage 2)
B1 = 1952311, B2 = 120000000 (P-1 stage 2)
B1 = 1952311, B2 = 60000000 (P-1 stage 2)
B1 = 1952311, B2 = 30000000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1952311 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
B1 = 4096, B2 = 409600 (P-1 stage 2)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 4096 (P-1 stage 1)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-05-12T09:17:49+00:00