is 2 1645421 - 1
has 495322 decimal digits
takes 0.073 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L24C3E2142CBE59E1double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26718.058668.6567%1000000200000000.13185.6860%18.190470.4389%1.7822%
PrimeNet2570.011763.1579%70001200000.00092.5621%0.012564.1018%0.9439%
GPU722610.186765.5738%6500800000.00071.1714%0.187465.9770%0.4033%
Difference+6+17.8719+3.0829%+993500+19920000+0.1311+4.5146%+18.0030+4.4619%+4.4619%

Known prime factors (1 factor, 73.8 bits, 0.00448237% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1645421159271635337611482011612373.7544839844493828980
22 × 5 × 6899 × 35076420451
2017-07-306899350764204511,942.6123.77231.17

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-02-29T17:07:00AxonManual testing100000100000---0.006--0.877%
2012-02-29T17:11:00AxonManual testing200000200000---0.013--1.281%
2012-02-29T18:07:00AxonManual testing300000300000---0.019--1.562%
2012-02-29T18:11:00AxonManual testing400000400000---0.026--1.781%
2012-02-29T19:09:00AxonManual testing500000500000---0.032--1.963%
2012-02-29T19:12:00AxonManual testing600000600000---0.039--2.120%
2012-02-29T20:08:00AxonManual testing700000700000---0.045--2.257%
2012-02-29T20:11:00AxonManual testing800000800000---0.052--2.380%
2012-02-29T21:09:00AxonManual testing900000900000---0.058--2.491%
2012-02-29T21:12:00AxonManual testing10000001000000---0.065--2.593%
2012-03-01T06:07:00AxonManual testing10000008000000---0.089--4.721%
2012-03-01T07:08:00AxonManual testing100000020000000---0.132--5.686%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-07T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-05-26T00:00:00ANONYMOUSv4_computers21258--0.023--
2016-02-23T16:28:44Mark RoseManual testing258260--0.070--
2010-04-28T11:20:00Architects Cubedm1_76l260261--0.093--
2016-02-23T16:28:44Mark RoseManual testing261262--0.187--
2010-08-03T22:35:00GrunwalderGIMPManual testing21263--0.970--
2016-02-23T16:28:44Mark RoseManual testing262263--0.597--
2015-05-06T17:29:00omylistManual testing263264--1.193--
2015-05-07T09:32:00monstManual testing264265--2.271--
2015-10-11T16:52:49ramgeisManual testing265266--4.542--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.112 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.112 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025014.06
50000500000010.056


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-07T00:00:00ANONYMOUSv4_computers24C3E2142CBE59E10.073
2015-06-27T00:57:00MadPooManual testing24C3E2142CBE59E10.073


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-28T13:09:53alpertronManual testing
15927163533761148201161
B16B96BB22DA71__no
2017-10-18T11:58:25Oliver KruseThreadripper
15927163533761148201161
B16B96BB22DA71__no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 20000000 (P-1 stage 2)
B1 = 1000000, B2 = 8000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 900000 (P-1 stage 1)
B1 = 800000 (P-1 stage 1)
B1 = 700000 (P-1 stage 1)
B1 = 600000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 400000 (P-1 stage 1)
B1 = 300000 (P-1 stage 1)
B1 = 200000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
257
250
260
270
280
290
2100
Last modified: 2019-11-18T17:51:12+00:00