is 2 2315771 - 1
has 697117 decimal digits
takes 0.156 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L87AB68639CBBB80Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26712.831167.1642%50000005050000003.158210.9769%15.989370.7685%3.6043%
PrimeNet2580.016662.0690%100001900000.00192.9317%0.018563.1810%1.1120%
GPU722620.265364.5161%130002000000.00231.7814%0.267665.1482%0.6321%
Difference+5+12.5658+2.6481%+4987000+504800000+3.1560+9.1955%+15.7218+5.6203%+5.6203%

Known prime factors (1 factor, 75.1 bits, 0.00324203% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2315771398758626278139187210872375.0788609629930553133
34 × 1734463 × 61282211
2009-02-071734463612822114,915.70.48770.6109

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-14T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.285%
2009-02-02T03:55:00axnManual testing100000020000000---0.199--5.910%
2018-02-26T11:40:36alpertronManual testing5000001500000012---0.126--5.214%
2021-05-07T22:22:50ViliamF35000000505000000-
skipped known factor: 39875862627813918721087
--3.158--10.977%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2009-01-17T21:49:00Sturle Sundenouchcraft.ifi260261--0.066--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CurvesCompleteFacMiss

New Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-01T00:00:00ANONYMOUSv4_computers87AB68639CBBB80B0.156


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-11T17:17:25Oliver KruseGTX-2
39875862627813918721087
2389A6BE87708A__no
2017-11-23T04:54:39kkmrkkblmbrbkc4.xlarge
39875862627813918721087
2389A6BE87708A__no


P-1 factor-bounds graph:
B1 = 5000000, B2 = 505000000 (P-1 stage 2)
B1 = 5000000 (P-1 stage 1)
B1 = 1000000, B2 = 20000000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
261
250
260
270
280
290
2100
Last modified: 2021-05-07T22:22:50+00:00