is 2 1920403 - 1
has 578099 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-LEE6C3542D01D5538double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26831.037769.1176%80000003200000001.96659.7398%33.004172.1255%3.0079%
PrimeNet2570.010063.1579%90001700000.00143.0929%0.011464.2974%1.1395%
GPU722610.160065.5738%100001700000.00151.7616%0.161466.1802%0.6065%
Difference+7+30.8777+3.5439%+7990000+319830000+1.9650+7.9782%+32.8427+5.9453%+5.9453%

Known prime factors (1 factor, 77.9 bits, 0.00405783% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19204032872679231841047284446712477.92774793656119081445
5 × 7 × 13 × 113 × 1454704971683
2020-08-03113145470497168319,6826,234.511,644

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-08-31T17:40:00kurlyhex100000030000000---0.203--5.686%
2017-12-18T23:07:46Jocelyn Larouchelow 4M20000002000000012---0.234--5.595%
2018-01-04T00:02:34Jocelyn Larouchelow 4M20000006000000012---0.406--6.836%
2018-01-04T08:58:44mikrS065800000032000000012---1.966--9.740%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2002-12-25T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:58Mark RoseManual testing258260--0.060--
2009-06-03T01:21:00Architects Cubedi4l_1260261--0.080--
2016-02-23T16:28:58Mark RoseManual testing261262--0.160--
2011-08-27T22:20:00GrunwalderGIMPManual testing21263--0.831--
2016-02-23T16:28:58Mark RoseManual testing262263--0.511--
2015-05-17T04:10:00snme2pm1Manual testing263264--1.022--
2015-05-17T04:10:00snme2pm1Manual testing264265--1.946--
2015-09-02T13:37:00ramgeisManual testing265266--3.891--
2018-06-04T13:10:06TJAOIManual testing266267--7.782--
2019-04-28T16:32:11chuenkitManual testing267268--15.56--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.993 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:18.993 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.4840.021%
25500000.76046.782%
302500000.04795.413%
3510000000.00299.785%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001389.58
50000500000010.069
5000075000001129.339


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-17T00:00:00Houndv4_computersEE6C3542D01D55380.104
2015-07-06T20:15:00MadPooManual testingEE6C3542D01D55380.104


PRP results:
dateuseridcompidcofactorsres64PRP
2020-08-03T06:39:11CrypticCluecruncher
287267923184104728444671
16EFEC99A8D03C19no
2020-08-04T04:22:01marssystemssystem11
287267923184104728444671
16EFEC99A8D03C19no


P-1 factor-bounds graph:
B1 = 8000000, B2 = 320000000 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000, B2 = 20000000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-02-17T11:37:13+00:00