is 2 1543207 - 1
has 464552 decimal digits
takes 0.069 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LAF3020FC8BD1C5A0double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26719.254768.6567%945000274050000.15465.9452%19.409270.5201%1.8634%
PrimeNet2570.012463.1579%65001100000.00082.4184%0.013264.0489%0.8910%
GPU722610.199165.5738%6500550000.00061.0161%0.199665.9236%0.3498%
Difference+6+19.0556+3.0829%+938500+27350000+0.1540+4.9290%+19.2096+4.5965%+4.5965%

Known prime factors (1 factor, 65.2 bits, 0.00422559% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1543207426645132299645334892065.21013823328053192
23 × 7 × 227 × 1087423541
2015-01-0622710874235415.57873.83727.1667

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers20000290000---0.002--0.993%
2011-02-03T03:56:00James HeinrichWHS800001340000---0.010--2.196%
2013-11-20T05:24:00David Campeaui5-2500k94500027405000---0.155--5.945%
2016-03-17T19:16:08alpertronManual testing5000001500000012---0.084--4.965%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-18T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-08-08T00:00:00ANONYMOUSv4_computers21258--0.025--
2010-04-28T15:20:00Architects Cubeda3_bu2260261--0.100--
2010-05-19T19:30:00GrunwalderGIMPManual testing21263--1.034--


ECM factoring results:

Old Calculation Method

Total ECM effort:31.233 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000301 / 1003.0104.855%
2550000301 / 2801.07534.064%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:31.233 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.2630.000%
25500001.39024.916%
302500000.11689.004%
3510000000.00899.198%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024813.86
50000500000030.168
250000400000005017.21


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-07T00:00:00ANONYMOUSv4_computersAF3020FC8BD1C5A00.069


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T17:15:17Oliver KruseGTX-2
42664513229964533489
9FE4AF51B49FE4__no
2017-10-30T11:54:38kkmrkkblmbrbkc4.xlarge
42664513229964533489
9FE4AF51B49FE4__no


P-1 factor-bounds graph:
B1 = 945000, B2 = 27405000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 945000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 80000, B2 = 1340000 (P-1 stage 2)
B1 = 80000 (P-1 stage 1)
B1 = 20000, B2 = 290000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
263
261
258
257
250
260
270
280
290
2100
Last modified: 2022-05-12T09:16:07+00:00