is 2 2011913 - 1
has 605647 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-L8E7F3E8E92E954FFdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26714.769068.6567%580000150800000.13065.2203%14.899670.2929%1.6362%
PrimeNet2580.019163.7931%90001500000.00162.6100%0.020764.7381%0.9450%
GPU722620.305466.1290%80001200000.00131.2722%0.306766.5599%0.4309%
Difference+5+14.4636+2.5277%+572000+14960000+0.1293+3.9480%+14.5929+3.7330%+3.7330%

Known prime factors (1 factor, 65.1 bits, 0.00323605% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2011913397225106053044376492065.1079871826119048
23 × 67 × 18417586043
2015-06-2967184175860434.468895.666178.68

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 testing201191201191---0.019--1.329%
2013-10-09T03:32:00David Campeaui5-2500k58000015080000---0.131--5.220%
2016-03-17T19:19:32alpertronManual testing5000001500000012---0.123--5.127%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-02T00:00:00ANONYMOUSv4_computers21258--0.019--
2022-03-09T07:16:45LordJuliusManual testing21260--0.076--
2009-01-05T01:48:00Sturle 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--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.224 GHz-days
Estimated T-Level:1.850
DigitsB1CurvesCompleteFacMiss
201100037 / 1000.37068.945%
255000037 / 2800.13287.601%

New Calculation Method

Total ECM effort:3.224 GHz-days
Estimated T-Level:1.850
DigitsB1CompleteFacMiss
20110001.21829.590%
25500000.11089.618%
302500000.00799.326%


ECM Summary

B1B2factorcurvesGHz-days
500005000000292.455
50000500000010.085
50000692793770.685


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-06-06T00:00:00ANONYMOUSv4_computers8E7F3E8E92E954FF0.132


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T21:52:19Oliver KruseGTX-3
39722510605304437649
D803EF91445082__no
2017-11-13T20:24:16Chang Chia-Tcheexbpc13
39722510605304437649
D803EF91445082__no


P-1 factor-bounds graph:
B1 = 580000, B2 = 15080000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 580000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 201191 (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)
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TF factor-bounds graph:
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Last modified: 2022-05-12T06:21:42+00:00