is 2 2016919 - 1
has 607154 decimal digits
takes 0.133 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1580AAFA452F6393double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26714.732368.6567%640000140800000.13085.2100%14.863270.2897%1.6330%
PrimeNet2580.019063.7931%90001500000.00162.6112%0.020664.7385%0.9454%
GPU722620.304666.1290%80001200000.00131.2729%0.305966.5602%0.4311%
Difference+5+14.4277+2.5277%+632000+13960000+0.1295+3.9371%+14.5572+3.7295%+3.7295%

Known prime factors (1 factor, 66.6 bits, 0.00330146% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
20169191109034431059584602392166.58827493281362801
1134503 × 24233767
2015-07-0111345032423376714.0280.22810.2351

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-04-28T00:00:00Jocelyn Larouchev4_computers20002000---0.000--0.022%
2002-05-05T00:00:00Jocelyn Larouchev4_computers30003000---0.000--0.040%
2003-02-02T00:00:00ANONYMOUSv4_computers30000547500---0.006--1.426%
2010-12-07T03:13:00Jocelyn LaroucheManual testing201691201691---0.019--1.331%
2013-10-16T11:35:00David Campeaui5-2500k64000014080000---0.131--5.210%
2016-03-17T19:19:36alpertronManual testing5000001500000012---0.123--5.128%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-02T00:00:00garyfuv4_computers21258--0.019--
2022-03-09T07:16:46LordJuliusManual testing21260--0.076--
2009-01-02T20:46:00Sturle Sundedoak.ifi260261--0.076--
2012-02-03T19:48:00Sebastian HornbostelManual testing261262--0.152--
2013-06-06T07:18:00David CampeauManual testing262263--0.487--
2015-03-15T12:12:00VictordeHollanderManual testing263264--0.973--
2015-03-15T12:12:00VictordeHollanderManual testing264265--1.853--


ECM factoring results:

Old Calculation Method

Total ECM effort:2.625 GHz-days
Estimated T-Level:1.550
DigitsB1CurvesCompleteFacMiss
201100031 / 1000.31073.230%
255000031 / 2800.11189.502%

New Calculation Method

Total ECM effort:2.625 GHz-days
Estimated T-Level:1.550
DigitsB1CompleteFacMiss
20110001.00036.788%
25500000.09091.358%
302500000.00699.445%


ECM Summary

B1B2factorcurvesGHz-days
500005000000292.455
50000500000020.169


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-17T00:00:00garyfuv4_computers1580AAFA452F63930.133


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T22:54:49Oliver KruseGTX-0
110903443105958460239
6E9119AA98C4AA__no
2017-11-13T21:28:41kkmrkkblmbrbkc4.xlarge
110903443105958460239
6E9119AA98C4AA__no


P-1 factor-bounds graph:
B1 = 640000, B2 = 14080000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 640000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 201691 (P-1 stage 1)
B1 = 30000, B2 = 547500 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
B1 = 3000 (P-1 stage 1)
B1 = 2000 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
TF factor-bounds graph:
267
265
264
263
262
261
260
258
250
260
270
280
290
2100
Last modified: 2022-03-09T07:16:46+00:00