is 2 1981669 - 1
has 596542 decimal digits
takes 0.130 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L27DAD553304C8776double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26714.994468.6567%1000000300000000.24606.2471%15.240470.6148%1.9580%
PrimeNet2580.019463.7931%80001400000.00142.4744%0.020864.6890%0.8959%
GPU722620.310066.1290%80001000000.00121.1974%0.311366.5346%0.4056%
Difference+5+14.6844+2.5277%+992000+29900000+0.2447+5.0497%+14.9291+4.0802%+4.0802%

Known prime factors (1 factor, 71.5 bits, 0.00360683% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
198166932827472351952953835672271.475828278394422907
3 × 5717 × 48293300357
2015-06-22571748293300357452.66250.85468.51

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-01-28T00:06:00kurlyhex100000030000000---0.246--6.247%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-27T00:00:00ANONYMOUSv4_computers21258--0.019--
2009-12-19T07:44:00S485122USB-W260261--0.078--
2011-07-01T19:06:00GrunwalderGIMPManual testing21263--0.805--
2015-03-15T01:17:00lycornManual testing263264--0.991--
2015-03-15T01:17:00lycornManual testing264265--1.885--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.301 GHz-days
Estimated T-Level:1.900
DigitsB1CurvesCompleteFacMiss
201100038 / 1000.38068.255%
255000038 / 2800.13687.288%

New Calculation Method

Total ECM effort:3.301 GHz-days
Estimated T-Level:1.900
DigitsB1CompleteFacMiss
20110001.25028.650%
25500000.11389.357%
302500000.00799.308%


ECM Summary

B1B2factorcurvesGHz-days
500005000000302.535
50000500000010.084
50000690000070.682


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02T00:00:00ANONYMOUSv4_computers27DAD553304C87760.130


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:24:43alpertronManual testing
3282747235195295383567
2316D59F83FF59__no
2017-10-20T14:55:46Oliver KruseThreadripper
3282747235195295383567
2316D59F83FF59__no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
267
265
264
263
261
258
250
260
270
280
290
2100
Last modified: 2022-03-07T23:35:03+00:00