is 2 2483867 - 1
has 747719 decimal digits
takes 0.172 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LE09C0B619FAF79F8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26823.996867.6471%2382500857701000.69657.5490%24.693370.0894%2.4423%
PrimeNet2590.030962.7119%100001800000.00192.5348%0.032963.6570%0.9452%
GPU722630.642665.0794%110001600000.00191.3803%0.644565.5614%0.4820%
Difference+5+23.3543+2.5677%+2371500+85610100+0.6946+6.1687%+24.0489+4.5280%+4.5280%

Known prime factors (1 factor, 90.2 bits, 0.00363157% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
248386714252490037625894390824715832890.203286901231781449940573
3 × 229 × 5449 × 132059 × 580351169
2020-08-08132059580351169158,043,9603.19265.9394

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-14T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.235%
2003-10-31T00:00:00Team Prime Ribv4_computers15000228750---0.003--0.786%
2010-11-20T12:25:00Jocelyn LaroucheManual testing2000020000---0.002--0.263%
2011-01-21T15:55:00Oscar Östlin950001947500---0.020--2.379%
2014-09-03T20:52:00Jocelyn LaroucheManual testing120840120840---0.012--0.917%
2014-11-08T13:05:00mikrMSI238250085770100---0.697--7.549%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-02T00:00:00ANONYMOUSv4_computers21259--0.031--
1999-06-15T00:00:00ANONYMOUSv4_computers21259--0.031--
2016-02-23T16:29:15Mark RoseManual testing259260--0.031--
2009-01-15T01:58:00Sturle Sundeghini.ifi260261--0.062--
2012-06-09T08:43:00Sebastian HornbostelManual testing261262--0.124--
2013-01-14T11:53:00dbaughManual testing262263--0.395--
2015-03-03T21:37:00VictordeHollanderManual testing263264--0.790--
2015-03-03T21:37:00VictordeHollanderManual testing264265--1.504--
2015-10-29T11:36:22ramgeisManual testing265266--3.009--
2017-07-22T20:28:37Gordon SpenceManual testing266267--6.017--
2019-06-24T09:35:57TJAOIManual testing267268--12.03--


ECM factoring results:

Old Calculation Method

Total ECM effort:5.970 GHz-days
Estimated T-Level:3.250
DigitsB1CurvesCompleteFacMiss
201100065 / 1000.65052.034%
255000065 / 2800.23279.250%

New Calculation Method

Total ECM effort:5.970 GHz-days
Estimated T-Level:3.250
DigitsB1CompleteFacMiss
20110002.09712.285%
25500000.19082.737%
302500000.01298.840%


ECM Summary

B1B2factorcurvesGHz-days
500005000000635.786
50000500000020.184


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-16T00:00:00ANONYMOUSv4_computersE09C0B619FAF79F80.172
1999-06-15T00:00:00ANONYMOUSv4_computersE09C0B619FAF79F80.172
2018-05-30T20:30:23kkmrkkblmbrbkoldE09C0B619FAF79F80.172


PRP results:
dateuseridcompidcofactorsres64PRP
2020-08-08T18:03:53EnsigmaT470
1425249003762589439082471583
9EE00CAA5EA7A3ABno
2020-08-08T22:30:07mnd9printer
1425249003762589439082471583
9EE00CAA5EA7A3ABno


P-1 factor-bounds graph:
B1 = 2382500, B2 = 85770100 (P-1 stage 2)
B1 = 2382500 (P-1 stage 1)
B1 = 95000, B2 = 1947500 (P-1 stage 2)
B1 = 120840 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
B1 = 15000, B2 = 228750 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
109
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
259
250
260
270
280
290
2100
Last modified: 2020-08-08T22:30:07+00:00