is 2 1257017 - 1
has 378400 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-LF9C60DE8EDB82272double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26723.638468.6567%300000100000000.03814.1862%23.676569.9688%1.3121%
PrimeNet2560.007662.5000%5500900000.00052.4392%0.008163.4147%0.9147%
GPU722600.122265.0000%5000320000.00030.8565%0.122565.2998%0.2998%
Difference+7+23.5163+3.6567%+295000+9968000+0.0378+3.3297%+23.5540+4.6690%+4.6690%

Known prime factors (1 factor, 61.4 bits, 0.00488434% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
125701730362787580192409591961.3971207731780087
3 × 7 × 1601 × 35921947
2011-05-091601359219470.29660.09000.1680

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-10-07T00:00:00ANONYMOUSv4_computers1000010000---0.000--0.142%
2003-09-21T00:00:00Team Prime Ribv4_computers100001000000---0.003--1.002%
2016-03-17T19:03:48alpertronManual testing3000001000000012---0.038--4.186%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-14T00:00:00ANONYMOUSv4_computers21257--0.015--
2003-06-01T00:00:00ANONYMOUSv4_computers21258--0.031--
2022-03-07T17:32:04LordJuliusManual testing258260--0.092--
2009-02-14T13:38:00Sturle Sundegouffy.ifi260261--0.122--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.497 GHz-days
Estimated T-Level:25.344
DigitsB1CurvesCompleteFacMiss
2011000325 / 1003.2503.815%
2550000325 / 2801.16131.261%
3025000044 / 6400.06993.351%

New Calculation Method

Total ECM effort:20.497 GHz-days
Estimated T-Level:25.344
DigitsB1CompleteFacMiss
201100015.2080.000%
25500001.66718.888%
302500000.13787.162%
3510000000.00999.076%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000028110.78
25000035000000449.71


Lucas-Lehmer results:
No L-L results for M1257017


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-29T19:27:07Oliver KruseGTX-1
3036278758019240959
05E26D2250C9AF__no
2017-10-21T00:27:04kkmrkkblmbrbkc4.xlarge
3036278758019240959
05E26D2250C9AF__no


P-1 factor-bounds graph:
B1 = 300000, B2 = 10000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 10000, B2 = 1000000 (P-1 stage 2)
B1 = 10000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
TF factor-bounds graph:
267
261
260
258
257
250
260
270
280
290
2100
Last modified: 2022-03-07T17:32:04+00:00