is 2 1903277 - 1
has 572944 decimal digits
takes 0.103 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L0C9420377655BBDAdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26831.317069.1176%80000003200000001.96659.7322%33.283472.1232%3.0055%
PrimeNet2570.010163.1579%90001600000.00143.0390%0.011464.2775%1.1196%
GPU722610.161465.5738%100001600000.00141.7279%0.162866.1686%0.5949%
Difference+7+31.1556+3.5439%+7990000+319840000+1.9650+8.0042%+33.1206+5.9545%+5.9545%

Known prime factors (1 factor, 81.7 bits, 0.00429098% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
190327738450035001454571451976732581.6691010100868172488068
22 × 3 × 67 × 10679219 × 117643843
2020-07-0210679219117643843410,3601.29851.7097

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-08-10T00:00:00Jocelyn Larouchev4_computers20000160000---0.002--0.732%
2011-02-07T12:36:00Carsten Kossendeyleela1050001785000---0.015--2.280%
2011-06-30T22:07:00kurlykk100000030000000---0.203--5.680%
2017-11-24T11:21:37mikrS063800000032000000012---1.966--9.732%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2011-02-05T00:00:00GrunwalderGIMPv4_computers21256--0.005--
2011-02-05T00:00:00GrunwalderGIMPv4_computers256257--0.005--
2002-01-02T00:00:00Jocelyn Larouchev4_computers21258--0.020--
2011-02-05T00:00:00GrunwalderGIMPv4_computers257258--0.010--
2011-02-05T00:00:00GrunwalderGIMPv4_computers258259--0.020--
2011-02-05T00:00:00GrunwalderGIMPv4_computers259260--0.040--
2011-02-05T00:00:00GrunwalderGIMPv4_computers260261--0.081--
2009-05-24T17:54:00Architects Cubedm1_fw260261--0.081--
2011-01-24T03:35:00GrunwalderGIMPGWPrime02261262--0.161--
2011-01-24T07:58:00GrunwalderGIMPGWPrime02262263--0.516--
2015-05-16T12:25:00omylistManual testing263264--1.032--
2015-05-16T17:55:00monstManual testing264265--1.963--
2015-08-31T08:30:00ramgeisManual testing265266--3.926--
2017-03-15T08:26:27Smok_bmvManual testing266267--7.852--
2019-04-25T20:32:09chuenkitManual testing267268--15.70--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.115 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.115 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.5200.020%
25500000.76346.637%
302500000.04795.393%
3510000000.00299.784%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001238.534
50000500000020.139
500006600000100.783
5000075000001169.66


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13T00:00:00ANONYMOUSv4_computers0C9420377655BBDA0.103
2015-06-29T14:43:00MadPooManual testing0C9420377655BBDA0.103


PRP results:
dateuseridcompidcofactorsres64PRP
2020-07-02T10:59:20CrypticClueManual testing
3845003500145457145197673
F3E6063BB6C37858no
2020-07-03T11:57:45marssystemssystem11
3845003500145457145197673
F3E6063BB6C37858no


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)
B1 = 105000, B2 = 1785000 (P-1 stage 2)
B1 = 105000 (P-1 stage 1)
B1 = 20000, B2 = 160000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
103
104
105
106
107
108
103
104
105
106
107
108
109
TF factor-bounds graph:
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267
266
265
264
263
262
261
260
259
258
257
256
250
260
270
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290
2100
Last modified: 2022-01-06T11:59:18+00:00