is 2 1909949 - 1
has 574952 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-L5D2FADEE44C8DF33double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26831.207669.1176%80000003200000001.96659.7352%33.174072.1241%3.0065%
PrimeNet2570.010163.1579%90001600000.00143.0409%0.011464.2782%1.1203%
GPU722610.160865.5738%100001700000.00151.7597%0.162366.1796%0.6058%
Difference+7+31.0467+3.5439%+7990000+319830000+1.9650+7.9755%+33.0117+5.9445%+5.9445%

Known prime factors:
No known factors for M1909949

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-06-16T06:21:00kurlykurlytop100000030000000---0.203--5.682%
2017-12-07T09:47:04mikrS066800000032000000012---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--
2009-05-27T15:41:00Architects Cubedi4l_1260261--0.080--
2011-03-09T02:34:00GrunwalderGIMPGWPrime02261262--0.161--
2011-03-09T06:02:00GrunwalderGIMPGWPrime02262263--0.514--
2015-05-18T08:20:00omylistManual testing263264--1.028--
2015-05-19T20:57:00monstManual testing264265--1.956--
2015-09-01T08:49:00ramgeisManual testing265266--3.913--
2017-03-15T08:26:28Smok_bmvManual testing266267--7.825--
2019-04-27T00:32:11chuenkitManual testing267268--15.65--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.839 GHz-days
Estimated T-Level:24.464
DigitsB1CurvesCompleteFacMiss
2011000250 / 1002.5008.106%
2550000250 / 2800.89340.883%

New Calculation Method

Total ECM effort:17.839 GHz-days
Estimated T-Level:24.464
DigitsB1CompleteFacMiss
20110009.7880.006%
25500000.90540.474%
302500000.05794.445%
3510000000.00399.733%


ECM Summary

B1B2factorcurvesGHz-days
50000500000019613.60
500006600000473.681
50000675000070.554


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1997-12-09T00:00:00ANONYMOUSv4_computers5D2FADEE44C8DF330.104
1997-12-30T00:00:00ANONYMOUSv4_computers5D2FADEE44C8DF330.104
1999-01-02T00:00:00ANONYMOUSv4_computers5D2FADEE44C8DF330.104
2015-07-14T15:04:00MadPooManual testing5D2FADEE44C8DF330.104


PRP results:
No PRP results for M1909949


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)
105
106
107
105
106
107
108
109
TF factor-bounds graph:
268
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266
265
264
263
262
261
260
259
258
257
256
250
260
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290
2100
Last modified: 2022-01-06T11:57:08+00:00