is 2 2526631 - 1
has 760592 decimal digits
takes 0.175 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L57DFAA0DE91763A6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.760367.1642%30000080000000.07244.3818%11.832768.6030%1.4388%
PrimeNet2590.030462.7119%110001900000.00212.6442%0.032563.6978%0.9860%
GPU722630.631765.0794%110001800000.00201.4346%0.633765.5803%0.5010%
Difference+4+11.1286+2.0848%+289000+7820000+0.0703+2.9472%+11.1989+3.0227%+3.0227%

Known prime factors (1 factor, 77.5 bits, 0.00306755% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
25266312145506123597581893258172477.50642457844528892068
22 × 35683757 × 297459181
2014-03-173568375729745918116,0685.02337.3039

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-23T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.292%
2003-10-31T00:00:00Team Prime Ribv4_computers15000236250---0.003--0.931%
2010-12-19T21:41:00Jocelyn LaroucheManual testing2000020000---0.002--0.315%
2011-01-02T14:09:00Jocelyn LaroucheManual testing3000030000---0.003--0.432%
2011-01-06T23:25:00Jocelyn LaroucheManual testing5000050000---0.005--0.619%
2011-03-14T12:24:00James HeinrichWHS3000008000000---0.072--4.382%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-15T00:00:00ANONYMOUSv4_computers21259--0.030--
2022-03-10T03:34:13LordJuliusManual testing21260--0.061--
2009-03-31T06:35:00Rob_Deetwopc260261--0.061--
2012-06-14T00:43:00Sebastian HornbostelManual testing261262--0.122--
2013-11-29T23:10:00lycornsnail262263--0.389--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.829 GHz-days
Estimated T-Level:0.450
DigitsB1CurvesCompleteFacMiss
20110009 / 1000.09091.352%
25500009 / 2800.03296.831%

New Calculation Method

Total ECM effort:0.829 GHz-days
Estimated T-Level:0.450
DigitsB1CompleteFacMiss
20110000.29074.802%
25500000.02697.410%
302500000.00299.839%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000090.829


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-09-07T00:00:00ANONYMOUSv4_computers57DFAA0DE91763A60.175


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-14T14:34:54Oliver KruseGTX-38DDECAC0D7EF26__no
2017-12-01T02:41:53kkmrkkblmbrbkc4.xlarge
214550612359758189325817
8DDECAC0D7EF26__no


P-1 factor-bounds graph:
B1 = 300000, B2 = 8000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 236250 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
107
108
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
263
262
261
260
259
250
260
270
280
290
2100
Last modified: 2022-03-10T03:34:13+00:00