is 2 1351283 - 1
has 406777 decimal digits
takes 0.052 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L9DEDB2A97BBE1286double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26721.989468.6567%500000150000000.07144.8862%22.060870.1882%1.5315%
PrimeNet2560.007162.5000%60001000000.00062.6135%0.007763.4801%0.9801%
GPU722600.113765.0000%5500400000.00040.9818%0.114165.3436%0.3436%
Difference+7+21.8757+3.6567%+494500+14960000+0.0710+3.9044%+21.9468+4.8446%+4.8446%

Known prime factors (1 factor, 61.5 bits, 0.00454983% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
135128332185282221891083511961.4811190915678725
52 × 1297 × 36728317
2011-05-091297367283170.32600.11090.2069

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00Team Prime Ribv4_computers15000217500---0.001--0.798%
2016-03-17T19:05:23alpertronManual testing5000001500000012---0.071--4.886%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-04T00:00:00ANONYMOUSv4_computers21257--0.014--
2003-06-30T00:00:00ANONYMOUSv4_computers21258--0.028--
2022-03-07T17:32:36LordJuliusManual testing258260--0.085--
2009-02-18T06:47:00Sturle Sundegibus.ifi260261--0.114--


ECM factoring results:

Old Calculation Method

Total ECM effort:25.207 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:25.207 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.65119.189%
302500000.14186.866%
3510000000.01099.021%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000025111.74
250000350000005013.47


Lucas-Lehmer results:
No L-L results for M1351283


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T07:34:09Oliver KruseGTX-1
3218528222189108351
A469D1EC320DD5__no
2017-10-24T14:13:58kkmrkkblmbrbkc4.xlarge
3218528222189108351
A469D1EC320DD5__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 15000, B2 = 217500 (P-1 stage 2)
B1 = 15000 (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: 2022-03-07T17:32:36+00:00