is 2 1955957 - 1
has 588802 decimal digits
takes 0.106 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LB2E896C600FC182Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26830.473569.1176%40000000204923747490881.227020.0539%911.700575.3107%6.1931%
Target2620.314166.1290%8000900000.00101.1539%0.315166.5199%0.3908%
Difference+6+30.1594+2.9886%+39992000+204923657490+881.2260+18.9000%+911.3855+8.7909%+5.8023%

Known prime factors (1 factor, 124.6 bits, 0.00637193% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19559573296381943802448337370690321401895366338124.6328426519457744849036483650513283
33 × 469879 × 558319 × 15582781 × 76343321909
2023-01-1915582781763433219098.569e+10328.35611.10

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-05-10T20:11:00kurlyhex100000030000000---0.203--5.698%
2018-01-19T13:04:09Jocelyn Larouchelow 4M19559573000000012---0.274--6.052%
2018-02-12T15:08:33Jocelyn Larouchelow 4M19559576000000012---0.403--6.837%
2018-03-03T12:04:31Jocelyn Larouchelow 4M195595712000000012---0.660--7.629%
2018-05-11T11:44:18Jocelyn Larouchelow 4M195595719559570012---0.984--8.191%
2018-11-26T12:54:00Jocelyn LaroucheManual testing195595724449462512---1.193--8.448%
2022-12-19T07:45:14Jocelyn LaroucheManual testing1955957854421750---3.807--9.899%
2023-01-11T01:53:47Jocelyn LaroucheManual testing19559571464372000---6.421--10.526%
2023-01-19T20:04:50RichD0Linux-5b4000000020492374749038124.632881.20.2121,76220.054%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2022-08-15T12:18:38masserManual testing15000005250000027--0.394


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-21T00:00:00gnicklev4_computers21258--0.020--
2016-02-23T16:29:00Mark RoseManual testing258260--0.059--
2010-01-14T14:20:00S485122USB-W260261--0.079--
2016-02-23T16:29:00Mark RoseManual testing261262--0.157--
2011-08-27T22:19:00GrunwalderGIMPManual testing21263--0.816--
2016-02-23T16:29:00Mark RoseManual testing262263--0.502--
2015-04-21T22:18:00lycornManual testing263264--1.004--
2015-04-21T22:18:00lycornManual testing264265--1.910--
2015-09-07T08:32:00ramgeisManual testing265266--3.821--
2018-01-22T18:13:15TJAOIManual testing266267--7.641--
2019-05-13T08:32:10chuenkitManual testing267268--15.28--


ECM factoring results:
Total ECM effort:19.709 GHz-days
Estimated T-Level:24.660
DigitsB1CompleteFacMiss
20110009.9170.005%
25500000.93239.376%
302500000.06094.165%
3510000000.00399.708%


ECM Summary

B1B2factorcurvesGHz-days
50000500000018212.67
500006750000211.668
500007500000463.846
25000023541903011.527


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-15T00:00:00ANONYMOUSv4_computersB2E896C600FC182B0.106
2015-07-03T04:32:00MadPooManual testingB2E896C600FC182B0.106


PRP results:
dateuseridcompidcofactorsres64PRP
2023-01-21T13:24:41RichD0Linux-7
32963819438024483373706903214018953663
F6F13377D4503FE9no


P-1 factor-bounds graph:
B1 = 40000000, B2 = 204923747490 (P-1 stage 2)
B1 = 1955957, B2 = 1464372000 (P-1 stage 2)
B1 = 1955957, B2 = 854421750 (P-1 stage 2)
B1 = 40000000 (P-1 stage 1)
B1 = 1955957, B2 = 244494625 (P-1 stage 2)
B1 = 1955957, B2 = 195595700 (P-1 stage 2)
B1 = 1955957, B2 = 120000000 (P-1 stage 2)
B1 = 1955957, B2 = 60000000 (P-1 stage 2)
B1 = 1955957, B2 = 30000000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1955957 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2023-01-21T13:24:41+00:00