is 2 1263461 - 1
has 380340 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-L9CEB4C1B99A22CC4double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26723.517968.6567%300000100000000.03814.1890%23.555969.9697%1.3130%
PrimeNet2560.007662.5000%5500900000.00052.4417%0.008163.4156%0.9156%
GPU722600.121665.0000%5500340000.00030.9084%0.121965.3179%0.3179%
Difference+7+23.3963+3.6567%+294500+9966000+0.0378+3.2806%+23.4341+4.6517%+4.6517%

Known prime factors (1 factor, 61.8 bits, 0.00488953% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
126346139520772220399103031961.7771563988608291
3 × 137 × 3805325081
2011-05-0913738053250810.43539.52817.796

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-24T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.239%
2003-12-23T00:00:00eteov4_computers2000005000000---0.021--3.419%
unknown30000010000000---0.038--4.189%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-10T00:00:00ANONYMOUSv4_computers21257--0.015--
2003-06-01T00:00:00ANONYMOUSv4_computers21258--0.030--
2022-03-07T17:32:04LordJuliusManual testing258260--0.091--
2009-02-15T18:29:00Sturle Sundeghini.ifi260261--0.122--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.243 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:19.243 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.1990.000%
25500001.59720.241%
302500000.13487.450%
3510000000.00999.082%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
5000050000002519.64
25000025000000509.60


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-08-31T00:00:00ANONYMOUSv4_computers9CEB4C1B99A22CC40.040


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-29T20:18:59Oliver KruseGTX-2
3952077222039910303
4D10E49A159230__no
2017-10-21T06:46:33kkmrkkblmbrbkc4.xlarge
3952077222039910303
4D10E49A159230__no


P-1 factor-bounds graph:
B1 = 300000, B2 = 10000000 (P-1 stage 2)
B1 = 200000, B2 = 5000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
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
1010
TF factor-bounds graph:
267
261
260
258
257
250
260
270
280
290
2100
Last modified: 2022-03-07T17:32:04+00:00