is 2 2774801 - 1
has 835299 decimal digits
takes 0.214 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L94F4A88B46E2EC34double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26710.708567.1642%11000023650000.02612.9285%10.734668.1258%0.9616%
PrimeNet2590.027762.7119%120002200000.00262.8571%0.030363.7772%1.0654%
GPU722630.575265.0794%150002400000.00311.7468%0.578265.6894%0.6100%
Difference+4+10.1333+2.0848%+95000+2125000+0.0230+1.1816%+10.1563+2.4364%+2.4364%

Known prime factors (1 factor, 68.2 bits, 0.00245646% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
27748013302154453117890006872168.16259502545463943
86257 × 689828599
2013-03-148625768982859921.6814.21827.8614

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-11-16T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.300%
2010-11-10T22:06:00Jocelyn LaroucheManual testing1500015000---0.002--0.252%
2010-11-28T21:46:00markrtiny1100002365000---0.026--2.928%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2009-01-28T23:50:00Sturle Sundebruckner.ifi260261--0.055--
2012-03-24T05:04:00Grant McCrackenthumper261262--0.111--
2013-01-10T10:21:00dbaughManual testing262263--0.354--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.624 GHz-days
Estimated T-Level:0.300
DigitsB1CurvesCompleteFacMiss
20110006 / 1000.06094.148%
25500006 / 2800.02197.876%

New Calculation Method

Total ECM effort:0.624 GHz-days
Estimated T-Level:0.300
DigitsB1CompleteFacMiss
20110000.23179.392%
25500000.02197.887%
302500000.00199.865%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000060.624


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-09T00:00:00Houndv4_computers94F4A88B46E2EC340.214


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-21T02:18:43Oliver KruseGTX-1
330215445311789000687
1E461CF6EBFBB0__no
2017-12-06T05:06:50kkmrkkblmbrbkc4.xlarge
330215445311789000687
1E461CF6EBFBB0__no


P-1 factor-bounds graph:
B1 = 110000, B2 = 2365000 (P-1 stage 2)
B1 = 110000 (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
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
263
262
261
250
260
270
280
290
2100
Last modified: 2017-12-06T05:06:50+00:00