is 2 1249151 - 1
has 376032 decimal digits
takes 0.040 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LCDCF477E9FB9A9F7double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26723.787368.6567%300000100000000.03814.1828%23.825469.9677%1.3110%
PrimeNet2560.007762.5000%5500900000.00052.4361%0.008163.4135%0.9135%
GPU722600.123065.0000%5000320000.00030.8552%0.123365.2993%0.2993%
Difference+7+23.6643+3.6567%+295000+9968000+0.0378+3.3276%+23.7021+4.6684%+4.6684%

Known prime factors (1 factor, 75.3 bits, 0.00602790% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1249151464314161233602392610572375.29818585189510059328
26 × 3 × 13 × 241 × 1871 × 16513213
2013-09-0618711651321310,0080.04140.0772

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-24T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.238%
2003-11-28T00:00:00eteov4_computers2000002000000---0.014--2.760%
2016-03-17T19:03:42alpertronManual testing3000001000000012---0.038--4.183%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-17T00:00:00ANONYMOUSv4_computers21257--0.015--
2003-06-01T00:00:00ANONYMOUSv4_computers21258--0.031--
2022-03-07T17:31:42LordJuliusManual testing258260--0.092--
2009-02-14T20:40:00Sturle Sundegilia.ifi260261--0.123--
2011-05-09T14:41:00XyzzyManual testing261262--0.246--
2012-10-07T08:33:00dbaughManual testing262263--0.786--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.361 GHz-days
Estimated T-Level:25.344
DigitsB1CurvesCompleteFacMiss
2011000322 / 1003.2203.931%
2550000322 / 2801.15031.599%
3025000044 / 6400.06993.351%

New Calculation Method

Total ECM effort:20.361 GHz-days
Estimated T-Level:25.344
DigitsB1CompleteFacMiss
201100015.0920.000%
25500001.65619.090%
302500000.13787.221%
3510000000.00999.079%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000027810.66
25000035000000449.70


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-08-17T00:00:00ANONYMOUSv4_computersCDCF477E9FB9A9F70.040


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-29T18:38:35Oliver KruseGTX-2
46431416123360239261057
DDF870B22739C1__no
2017-10-20T17:28:27kkmrkkblmbrbkc4.xlarge
46431416123360239261057
DDF870B22739C1__no


P-1 factor-bounds graph:
B1 = 300000, B2 = 10000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 200000, B2 = 2000000 (P-1 stage 2)
B1 = 200000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
TF factor-bounds graph:
267
263
262
261
260
258
257
250
260
270
280
290
2100
Last modified: 2022-03-07T17:31:42+00:00