is 2 1254791 - 1
has 377730 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-L647FB50C880282F9double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26723.680468.6567%300000100000000.03814.1852%23.718469.9685%1.3118%
PrimeNet2560.007762.5000%5500900000.00052.4383%0.008163.4144%0.9144%
GPU722600.122465.0000%5000320000.00030.8561%0.122765.2996%0.2996%
Difference+7+23.5580+3.6567%+295000+9968000+0.0378+3.3291%+23.5957+4.6689%+4.6689%

Known prime factors (1 factor, 73.0 bits, 0.00581469% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
125479192007517035539263132332272.9623666248683467576
23 × 3 × 47 × 26821 × 121181927
2014-02-18268211211819271,431.40.30460.5667

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-24T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.239%
2003-11-28T00:00:00eteov4_computers2000002000000---0.014--2.762%
2016-03-17T19:03:47alpertronManual testing3000001000000012---0.038--4.185%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-14T00:00:00ANONYMOUSv4_computers21257--0.015--
2003-06-01T00:00:00ANONYMOUSv4_computers21258--0.031--
2022-03-07T17:32:03LordJuliusManual testing258260--0.092--
2009-02-16T15:14:00Sturle Sundegonsha.ifi260261--0.122--
2011-05-09T14:41:00XyzzyManual testing261262--0.245--
2012-10-11T11:56:00dbaughManual testing262263--0.782--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.376 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:20.376 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
50000500000027810.67
25000035000000449.71


Lucas-Lehmer results:
No L-L results for M1254791


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-29T19:11:46Oliver KruseGTX-1
9200751703553926313233
C0C20E81790C13__no
2017-10-20T21:49:50kkmrkkblmbrbkc4.xlarge
9200751703553926313233
C0C20E81790C13__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
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104
105
106
102
103
104
105
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107
108
109
TF factor-bounds graph:
267
263
262
261
260
258
257
250
260
270
280
290
2100
Last modified: 2022-03-07T17:32:03+00:00