is 2 1870711 - 1
has 563141 decimal digits
takes 0.101 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LCCEB9035463CB563double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.883868.6567%1665792299842560.25246.4927%16.136270.6917%2.0350%
PrimeNet2570.010363.1579%90001600000.00143.0293%0.011664.2740%1.1161%
GPU722610.164265.5738%100001500000.00141.6898%0.165666.1555%0.5817%
Difference+6+15.7196+3.0829%+1655792+29834256+0.2510+4.8029%+15.9706+4.5362%+4.5362%

Known prime factors (1 factor, 78.0 bits, 0.00416973% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18707113029837343574246260679932478.00480980903612964436
22 × 3 × 101 × 103 × 648698321101
2017-06-0610364869832110141,4782,780.25,192.6

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-09T22:10:00markrtiny2750006000000---0.046--3.928%
2015-10-07T09:23:59Bruno Victal5820K-linux5000001500000012---0.101--5.082%
2016-09-10T04:18:08Jocelyn Larouchelow 4M5000003000000012---0.166--5.746%
2016-10-08T03:34:30Jocelyn Larouchelow 4M500000396000006---0.207--6.015%
2016-11-03T20:53:42Jocelyn Larouchelow 4M600000600000---0.047--2.160%
2016-12-21T00:09:31Jocelyn Larouchelow 4M720000720000---0.057--2.325%
2017-01-03T05:50:41Jocelyn Larouchelow 4M864000864000---0.068--2.497%
2017-01-21T06:59:42Jocelyn Larouchelow 4M11568001156800---0.091--2.786%
2017-05-22T21:10:28Jocelyn Larouchelow 4M13881601388160012---0.163--5.523%
2017-06-19T04:39:20Jocelyn Larouchelow 4M16657922998425612---0.252--6.493%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:56Mark RoseManual testing258260--0.062--
2010-04-10T15:57:00Architects CubedManual testing260261--0.082--
2016-02-23T16:28:56Mark RoseManual testing261262--0.164--
2011-03-08T05:15:00GrunwalderGIMPManual testing21263--0.853--
2016-02-23T16:28:56Mark RoseManual testing262263--0.525--
2015-05-08T22:25:00snme2pm1Manual testing263264--1.050--
2015-05-08T22:25:00snme2pm1Manual testing264265--1.997--
2015-09-11T08:33:00ramgeisManual testing265266--3.995--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.749 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:19.749 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.7960.015%
25500000.79745.076%
302500000.04995.191%
3510000000.00299.774%


ECM Summary

B1B2factorcurvesGHz-days
500005000000432.977
50000500000020.138
50000660000021316.63


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-29T00:00:00ANONYMOUSv4_computersCCEB9035463CB5630.101
2015-07-16T04:00:00MadPooManual testingCCEB9035463CB5630.101


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-28T13:09:06alpertronManual testing
302983734357424626067993
0CDADA495D9A32__no
2017-10-20T01:31:44Oliver KruseThreadripper
302983734357424626067993
0CDADA495D9A32__no


P-1 factor-bounds graph:
B1 = 1665792, B2 = 29984256 (P-1 stage 2)
B1 = 500000, B2 = 39600000 (P-1 stage 2)
B1 = 500000, B2 = 30000000 (P-1 stage 2)
B1 = 1388160, B2 = 13881600 (P-1 stage 2)
B1 = 1665792 (P-1 stage 1)
B1 = 1388160 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1156800 (P-1 stage 1)
B1 = 864000 (P-1 stage 1)
B1 = 720000 (P-1 stage 1)
B1 = 600000 (P-1 stage 1)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
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: 2021-09-17T08:22:26+00:00