is 2 1909703 - 1
has 574878 decimal digits
takes 0.104 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF55D22EDA9D27AA7double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26831.211669.1176%80000003200000001.96659.7351%33.178072.1241%3.0064%
PrimeNet2570.010163.1579%90001600000.00143.0409%0.011464.2782%1.1203%
GPU722610.160965.5738%100001700000.00151.7597%0.162366.1796%0.6058%
Difference+7+31.0507+3.5439%+7990000+319830000+1.9650+7.9754%+33.0157+5.9445%+5.9445%

Known prime factors (1 factor, 78.0 bits, 0.00408696% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19097033126454240554037814900412478.04981857080408682340
22 × 32 × 5 × 822791 × 552706043
2020-04-0882279155270604334,1372.43004.4242

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-06-14T18:15:00kurlykurlytop100000030000000---0.203--5.682%
2017-12-06T16:28:50mikrS063800000032000000012---1.966--9.735%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2011-04-14T00:00:00GrunwalderGIMPv4_computers21256--0.005--
2011-04-14T00:00:00GrunwalderGIMPv4_computers256257--0.005--
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.020--
2011-04-14T00:00:00GrunwalderGIMPv4_computers257258--0.010--
2011-04-14T00:00:00GrunwalderGIMPv4_computers258259--0.020--
2011-04-14T00:00:00GrunwalderGIMPv4_computers259260--0.040--
2011-04-14T00:00:00GrunwalderGIMPv4_computers260261--0.080--
2009-05-27T10:09:00Architects Cubedi4l_1260261--0.080--
2011-03-07T00:25:00GrunwalderGIMPGWPrime02261262--0.161--
2011-03-07T03:53:00GrunwalderGIMPGWPrime02262263--0.514--
2015-05-18T08:20:00omylistManual testing263264--1.028--
2015-05-19T20:04:00monstManual testing264265--1.957--
2015-09-01T08:49:00ramgeisManual testing265266--3.913--
2017-03-15T08:26:28Smok_bmvManual testing266267--7.826--
2019-04-27T00:32:11chuenkitManual testing267268--15.65--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.703 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:18.703 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.4170.022%
25500000.76246.675%
302500000.04795.402%
3510000000.00299.784%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001057.288
50000500000020.139
50000660000014411.28


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-17T00:00:00ANONYMOUSv4_computersF55D22EDA9D27AA70.104
2015-07-14T15:04:00MadPooManual testingF55D22EDA9D27AA70.104


PRP results:
dateuseridcompidcofactorsres64PRP
2020-04-08T16:24:23CrypticCluecruncher
312645424055403781490041
85A2BE5352F6586Ano
2020-04-11T11:32:17GANKL-SCH02
312645424055403781490041
85A2BE5352F6586Ano


P-1 factor-bounds graph:
B1 = 8000000, B2 = 320000000 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
104
105
106
107
104
105
106
107
108
109
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
259
258
257
256
250
260
270
280
290
2100
Last modified: 2021-12-23T11:05:23+00:00