is 2 1436257 - 1
has 432357 decimal digits
takes 0.055 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LCF2BE8C038D49DEDdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26720.688468.6567%500000150000000.07144.9225%20.759970.1996%1.5429%
PrimeNet2560.006762.5000%65001100000.00072.7759%0.007463.5410%1.0410%
GPU722600.106965.0000%6000900000.00061.3543%0.107565.4740%0.4740%
Difference+7+20.5815+3.6567%+494000+14910000+0.0708+3.5681%+20.6523+4.7256%+4.7256%

Known prime factors (1 factor, 60.1 bits, 0.00418497% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
143625712416298618521510631960.107432245016683
65479 × 6601277
2008-12-166547966012770.15190.02330.0372

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers15000243750---0.002--0.837%
2016-03-17T19:14:18alpertronManual testing5000001500000012-
skipped known factor: 1241629861852151063
--0.071--4.922%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-10-13T00:00:00ANONYMOUSv4_computers21257--0.013--
2003-07-21T00:00:00ANONYMOUSv4_computers21258--0.027--


ECM factoring results:

Old Calculation Method

Total ECM effort:25.344 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000298 / 1002.9805.004%
2550000298 / 2801.06434.432%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:25.344 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.5380.000%
25500001.64019.395%
302500000.14086.925%
3510000000.01099.024%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000024811.72
250000350000005013.62


Lucas-Lehmer results:
No L-L results for M1436257


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T23:07:17Oliver KruseGTX-3
1241629861852151063
5A60EA23DFD3B8__no
2017-10-27T02:33:54kkmrkkblmbrbkc4.xlarge
1241629861852151063
5A60EA23DFD3B8__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 15000, B2 = 243750 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
TF factor-bounds graph:
267
258
257
250
260
270
280
290
2100
Last modified: 2021-09-29T12:09:30+00:00