is 2 1992919 - 1
has 599929 decimal digits
takes 0.131 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LDF8551BFC3C7D940double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual271239.888570.4225%1000000300000000.24604.3272%240.134471.7024%1.2799%
PrimeNet2580.019363.7931%80001400000.00142.4772%0.020764.6900%0.8969%
GPU722620.308366.1290%80001100000.00131.2357%0.309666.5476%0.4185%
Difference+9+239.5802+4.2935%+992000+29890000+0.2447+3.0915%+239.8249+5.1548%+5.1548%

Known prime factors (1 factor, 73.9 bits, 0.00370720% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1992919174002331228093550836072373.8824365514384380237
3 × 11 × 312 × 137656935149
2016-04-059611376569351491,570.0715.021,335.5

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-06-29T04:47:00kurlyhex100000030000000---0.246--4.327%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-27T00:00:00ANONYMOUSv4_computers21258--0.019--
2016-02-23T16:29:02Mark RoseManual testing258260--0.058--
2009-12-09T18:50:00S485122USB-W260261--0.077--
2011-05-03T03:22:00XyzzyManual testing261262--0.154--
2011-05-03T03:22:00XyzzyManual testing262263--0.493--
2011-05-03T03:22:00XyzzyManual testing263264--0.985--
2011-05-03T03:22:00XyzzyManual testing264265--1.875--
2014-01-04T17:30:00Never Odd Or EvenManual testing265266--3.750--
2014-01-04T17:30:00Never Odd Or EvenManual testing266267--7.499--
2014-01-04T17:30:00Never Odd Or EvenManual testing267268--15.00--
2014-01-04T17:30:00Never Odd Or EvenManual testing268269--30.00--
2014-01-04T17:30:00Never Odd Or EvenManual testing269270--59.99--
2015-10-23T09:34:54ramgeisManual testing270271--120.0--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.420 GHz-days
Estimated T-Level:1.800
DigitsB1CurvesCompleteFacMiss
201100036 / 1000.36069.641%
255000036 / 2800.12987.915%

New Calculation Method

Total ECM effort:3.420 GHz-days
Estimated T-Level:1.800
DigitsB1CompleteFacMiss
20110001.20330.020%
25500000.10789.838%
302500000.00799.346%


ECM Summary

B1B2factorcurvesGHz-days
500005000070.355
500005000000282.367
50000500000010.085
50000545000070.613


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-17T00:00:00ANONYMOUSv4_computersDF8551BFC3C7D9400.131
2015-07-12T18:10:00MadPooManual testingDF8551BFC3C7D9400.131


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T16:32:04Oliver KruseGTX-1
17400233122809355083607
E245C8F3C22B56__no
2017-11-12T23:04:49kkmrkkblmbrbkc4.xlarge
17400233122809355083607
E245C8F3C22B56__no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
271
270
269
268
267
266
265
264
263
262
261
260
258
250
260
270
280
290
2100
Last modified: 2022-03-15T11:22:37+00:00