is 2 1254541 - 1
has 377655 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-LEA42828444EA32CCdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26723.685168.6567%300000100000000.03814.1851%23.723269.9685%1.3118%
PrimeNet2560.007762.5000%5500900000.00052.4382%0.008163.4143%0.9143%
GPU722600.122465.0000%5000320000.00030.8561%0.122765.2996%0.2996%
Difference+7+23.5627+3.6567%+295000+9968000+0.0378+3.3291%+23.6004+4.6689%+4.6689%

Known prime factors (1 factor, 62.0 bits, 0.00494146% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
125454145880263756058653911961.9931828567729395
32 × 5 × 112 × 335825111
2011-05-091213358251110.44600.84091.5705

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%
2016-03-17T19:03:46alpertronManual 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--
2009-02-16T00:39:00Sturle Sundegonsha.ifi260261--0.122--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.490 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:20.490 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 M1254541


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-29T19:10:36Oliver KruseGTX-1
4588026375605865391
E8D58A235514C0__no
2017-10-20T21:32:08kkmrkkblmbrbkc4.xlarge
4588026375605865391
E8D58A235514C0__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)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
261
260
258
257
250
260
270
280
290
2100
Last modified: 2022-03-07T17:32:03+00:00