is 2 1829623 - 1
has 550772 decimal digits
takes 0.099 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L00882CF150787136double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.240568.6567%2780000150000000.27115.8436%16.511570.4883%1.8316%
PrimeNet2570.010563.1579%80001500000.00122.8790%0.011764.2186%1.0607%
GPU722610.167965.5738%90001400000.00131.5945%0.169266.1227%0.5489%
Difference+6+16.0726+3.0829%+2771000+14860000+0.2698+4.2491%+16.3424+4.3656%+4.3656%

Known prime factors (1 factor, 86.5 bits, 0.00472926% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18296231115322852417545297271600732786.52830479581105439352732
22 × 32 × 325463 × 960059 × 2709611
2015-06-17960059270961112,703,5040.08300.1537

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-10T06:34:00Carsten Kossendeyleela1000001675000---0.015--2.491%
2014-05-19T21:00:00Jocelyn LaroucheManual testing135081135081---0.011--1.060%
2014-09-22T21:00:00Jocelyn LaroucheManual testing170162170162---0.013--1.200%
2015-06-17T17:35:00mikrMSI2780000150000002786.5280.2190.1990.4375.844%
2016-03-16T12:39:19alpertronManual testing5000001500000012---0.101--5.068%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-16T00:00:00ANONYMOUSv4_computers21258--0.021--
2010-04-10T20:20:00Architects CubedManual testing260261--0.084--
2011-01-21T16:10:00GrunwalderGIMPManual testing21263--0.872--
2015-04-26T04:57:00snme2pm1Manual testing263264--1.073--
2015-04-26T04:57:00snme2pm1Manual testing264265--2.042--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.454 GHz-days
Estimated T-Level:24.786
DigitsB1CurvesCompleteFacMiss
2011000268 / 1002.6806.764%
2550000268 / 2800.95738.333%

New Calculation Method

Total ECM effort:20.454 GHz-days
Estimated T-Level:24.786
DigitsB1CompleteFacMiss
20110009.1370.011%
25500000.82843.707%
302500000.05195.010%
3510000000.00299.765%


ECM Summary

B1B2factorcurvesGHz-days
500005000000473.246
50000660000022117.21


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computers00882CF1507871360.099


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T01:23:52Oliver KruseGTX-2
111532285241754529727160073
AFF6F9065CA3DA__no
2017-11-06T10:25:13bayanneiMac1
111532285241754529727160073
AFF6F9065CA3DA__no


P-1 factor-bounds graph:
B1 = 2780000, B2 = 15000000 (P-1 stage 2)
B1 = 2780000 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 100000, B2 = 1675000 (P-1 stage 2)
B1 = 170162 (P-1 stage 1)
B1 = 135081 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
104
105
106
107
104
105
106
107
108
TF factor-bounds graph:
267
265
264
263
261
258
250
260
270
280
290
2100
Last modified: 2021-04-23T12:19:17+00:00