is 2 1794217 - 1
has 540114 decimal digits
takes 0.097 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L9BE4C191A963B565double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.560968.6567%36422001234567890.80008.6562%17.360971.3698%2.7131%
PrimeNet2570.010763.1579%80001400000.00122.8157%0.011964.1953%1.0374%
GPU722610.171265.5738%80001300000.00121.4941%0.172466.0881%0.5144%
Difference+6+16.3897+3.0829%+3634200+123326789+0.7988+7.1621%+17.1886+5.2817%+5.2817%

Known prime factors (1 factor, 76.6 bits, 0.00427167% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17942171179945163203088853515992476.64332881896760622847
3 × 7 × 1565804607648707
2016-08-147156580460764870712,6786,710,64712,533,620

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-10T06:34:00Carsten Kossendeyleela950001638750---0.014--2.447%
2014-04-27T11:48:00ANONYMOUSManual testing145000145000---0.011--1.098%
2014-10-05T22:22:00Jocelyn LaroucheManual testing180773180773---0.014--1.234%
2015-01-10T14:01:00Jocelyn LaroucheManual testing271159271159---0.021--1.510%
2015-02-06T22:00:00Jocelyn LaroucheManual testing542318542318---0.043--2.058%
2015-03-29T20:50:00Jocelyn LaroucheManual testing596549596549---0.047--2.142%
2015-04-08T16:59:00Jocelyn LaroucheManual testing656203656203---0.052--2.227%
2015-05-01T17:21:00Jocelyn LaroucheManual testing794005794005---0.062--2.402%
2015-05-22T00:28:00Jocelyn LaroucheManual testing873405873405---0.069--2.493%
2015-06-08T13:42:00Jocelyn LaroucheManual testing960745960745---0.076--2.585%
2015-06-25T21:14:00Jocelyn LaroucheManual testing10568191056819---0.083--2.679%
2015-07-07T18:13:00Jocelyn LaroucheManual testing11625001162500---0.091--2.775%
2015-07-13T12:24:00Jocelyn LaroucheManual testing12787501278750---0.101--2.873%
2015-07-21T01:20:00Jocelyn LaroucheManual testing14066251406625---0.111--2.973%
2015-07-31T12:12:00Jocelyn LaroucheManual testing15472871547287---0.122--3.074%
2015-09-20T11:32:00Jocelyn LaroucheManual testing17020151702015---0.134--3.178%
2015-09-27T21:23:23Jocelyn LaroucheManual testing18722161872216---0.147--3.283%
2015-10-02T22:01:20Jocelyn LaroucheManual testing20594372059437---0.162--3.390%
2015-10-14T12:07:31mikrMSI364220012345678912---0.800--8.656%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:52Mark RoseManual testing258260--0.064--
2010-04-19T13:16:00Architects Cubeda3_bu2260261--0.086--
2016-02-23T16:28:52Mark RoseManual testing261262--0.171--
2010-11-18T02:51:00GrunwalderGIMPManual testing21263--0.890--
2016-02-23T16:28:52Mark RoseManual testing262263--0.547--
2015-05-03T00:51:00snme2pm1Manual testing263264--1.094--
2015-05-03T00:51:00snme2pm1Manual testing264265--2.082--
2015-09-13T19:11:00ramgeisManual testing265266--4.165--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.298 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.298 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025017.23
50000500000010.069


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-06T00:00:00ANONYMOUSv4_computers9BE4C191A963B5650.097
2015-07-18T18:31:00MadPooManual testing9BE4C191A963B5650.097


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T17:06:51Oliver KruseGTX-0
117994516320308885351599
C8A2D8757068E0__no
2017-11-05T10:27:05kkmrkkblmbrbkold
117994516320308885351599
C8A2D8757068E0__no


P-1 factor-bounds graph:
B1 = 3642200, B2 = 123456789 (P-1 stage 2)
B1 = 3642200 (P-1 stage 1)
B1 = 2059437 (P-1 stage 1)
B1 = 1872216 (P-1 stage 1)
B1 = 1702015 (P-1 stage 1)
B1 = 1547287 (P-1 stage 1)
B1 = 1406625 (P-1 stage 1)
B1 = 1278750 (P-1 stage 1)
B1 = 1162500 (P-1 stage 1)
B1 = 1056819 (P-1 stage 1)
B1 = 960745 (P-1 stage 1)
B1 = 873405 (P-1 stage 1)
B1 = 794005 (P-1 stage 1)
B1 = 656203 (P-1 stage 1)
B1 = 596549 (P-1 stage 1)
B1 = 542318 (P-1 stage 1)
B1 = 271159 (P-1 stage 1)
B1 = 180773 (P-1 stage 1)
B1 = 95000, B2 = 1638750 (P-1 stage 2)
B1 = 145000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-01-01T10:30:09+00:00