is 2 1905437 - 1
has 573594 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-LB95CDB64925FAA15double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26831.281569.1176%80000003200000001.96659.7332%33.247972.1235%3.0058%
PrimeNet2570.010163.1579%90001600000.00143.0396%0.011464.2778%1.1199%
GPU722610.161265.5738%100001600000.00141.7283%0.162666.1688%0.5950%
Difference+7+31.1203+3.5439%+7990000+319840000+1.9650+8.0048%+33.0853+5.9547%+5.9547%

Known prime factors (1 factor, 78.4 bits, 0.00411401% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19054373960124142458979885902092478.390103916428159497792
26 × 3 × 233 × 2322881530747
2020-01-18233232288153074753,4909,955.318,594

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-06-09T01:34:00kurlyslice100000030000000---0.203--5.681%
2017-11-27T11:41:02mikrS061800000032000000012---1.966--9.733%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2011-04-14T00:00:00GrunwalderGIMPv4_computers21256--0.005--
2011-04-14T00:00:00GrunwalderGIMPv4_computers256257--0.005--
2002-01-02T00:00:00Jocelyn Larouchev4_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--0.081--
2009-05-25T12:15:00Architects Cubedi4l_1260261--0.081--
2011-02-07T07:13:00GrunwalderGIMPGWPrime02261262--0.161--
2011-02-07T07:13:00GrunwalderGIMPGWPrime02262263--0.515--
2015-05-17T05:14:00omylistManual testing263264--1.030--
2015-05-19T06:11:00omylistManual testing264265--1.961--
2015-08-31T08:30:00ramgeisManual testing265266--3.922--
2017-03-15T08:26:27Smok_bmvManual testing266267--7.844--
2019-04-26T04:32:10chuenkitManual testing267268--15.69--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.956 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:18.956 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.4820.021%
25500000.76846.393%
302500000.04795.364%
3510000000.00299.782%


ECM Summary

B1B2factorcurvesGHz-days
500005000000755.204
50000500000030.208
50000660000017313.54


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computersB95CDB64925FAA150.103
2015-07-14T15:04:00MadPooManual testingB95CDB64925FAA150.103


PRP results:
dateuseridcompidcofactorsres64PRP
2020-01-23T15:33:26mnd975211backdoor
396012414245897988590209
B3BD0D363F685AA7no
2020-02-06T00:00:20mnd9f3b
396012414245897988590209
B3BD0D363F685AA7no


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)
101
102
103
104
105
106
107
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
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: 2022-01-18T14:07:39+00:00