is 2 2011957 - 1
has 605660 decimal digits
takes 0.132 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L4EB6FBA02B5BC5F8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26714.768768.6567%580000150800000.13065.2203%14.899370.2929%1.6362%
PrimeNet2580.019163.7931%90001500000.00162.6100%0.020764.7381%0.9450%
GPU722620.305466.1290%80001200000.00131.2722%0.306766.5600%0.4309%
Difference+5+14.4633+2.5277%+572000+14960000+0.1293+3.9480%+14.5926+3.7330%+3.7330%

Known prime factors (1 factor, 71.3 bits, 0.00354597% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
201195729958191683748843795992271.343744503776267307
7 × 251 × 618971 × 684581
2017-10-30618971684581252.390.05940.1201

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%
2003-01-25T00:00:00ANONYMOUSv4_computers30000547500---0.006--1.425%
2003-11-16T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.273%
2010-12-02T22:33:00Jocelyn LaroucheManual testing201195201195---0.019--1.329%
2013-10-09T03:32:00David Campeaui5-2500k58000015080000---0.131--5.220%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-02T00:00:00ANONYMOUSv4_computers21258--0.019--
2016-02-23T16:29:03Mark RoseManual testing258260--0.057--
2009-01-05T02:20:00Sturle Sundecorbusier.ifi260261--0.076--
2012-01-31T07:47:00Sebastian HornbostelManual testing261262--0.153--
2013-02-11T20:23:00dbaughManual testing262263--0.488--
2015-03-15T12:12:00VictordeHollanderManual testing263264--0.976--
2015-03-15T12:12:00VictordeHollanderManual testing264265--1.857--
2015-10-29T11:36:21ramgeisManual testing265266--3.714--
2016-07-16T16:15:42Gordon SpenceManual testing266267--7.428--


ECM factoring results:

Old Calculation Method

Total ECM effort:6.602 GHz-days
Estimated T-Level:3.900
DigitsB1CurvesCompleteFacMiss
201100078 / 1000.78045.661%
255000078 / 2800.27975.649%

New Calculation Method

Total ECM effort:6.602 GHz-days
Estimated T-Level:3.900
DigitsB1CompleteFacMiss
20110003.0004.979%
25500000.27875.761%
302500000.01898.264%


ECM Summary

B1B2factorcurvesGHz-days
500005000000332.793
500005000000453.809


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10T00:00:00ANONYMOUSv4_computers4EB6FBA02B5BC5F80.132
2016-06-21T11:38:33Mark Roseslink4EB6FBA02B5BC5F80.132


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-31T13:00:21YarBerManual testing
2995819168374884379599
060AB4439DF475__no
2017-10-31T23:51:46Oliver KruseGTX-3
2995819168374884379599
060AB4439DF475__no
2017-11-01T06:53:19YarBerManual testing
2995819168374884379599
060AB4439DF475__no


P-1 factor-bounds graph:
B1 = 580000, B2 = 15080000 (P-1 stage 2)
B1 = 580000 (P-1 stage 1)
B1 = 201195 (P-1 stage 1)
B1 = 30000, B2 = 547500 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 3000 (P-1 stage 1)
B1 = 2048 (P-1 stage 1)
B1 = 2000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
250
260
270
280
290
2100
Last modified: 2017-11-01T06:53:19+00:00