is 2 1916737 - 1
has 576996 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-LAD1970AE7ECA370Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26831.097169.1176%80000003200000001.96659.7382%33.063572.1250%3.0074%
PrimeNet2570.010063.1579%90001700000.00143.0919%0.011464.2970%1.1391%
GPU722610.160365.5738%100001700000.00151.7609%0.161766.1800%0.6062%
Difference+7+30.9368+3.5439%+7990000+319830000+1.9650+7.9773%+32.9018+5.9450%+5.9450%

Known prime factors:
No known factors for M1916737

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-08-26T11:31:00kurlyhex100000030000000---0.203--5.685%
2017-12-17T16:07:12mikrS067800000032000000012---1.966--9.738%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-01T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:58Mark RoseManual testing258260--0.060--
2009-06-01T01:27:00Architects Cubedi4l_1260261--0.080--
2016-02-23T16:28:58Mark RoseManual testing261262--0.160--
2011-07-17T18:55:00GrunwalderGIMPManual testing21263--0.833--
2016-02-23T16:28:58Mark RoseManual testing262263--0.512--
2015-05-16T20:58:00snme2pm1Manual testing263264--1.024--
2015-05-16T20:58:00snme2pm1Manual testing264265--1.949--
2015-09-02T13:37:00ramgeisManual testing265266--3.899--
2017-03-15T08:26:30Smok_bmvManual testing266267--7.797--
2019-04-28T04:32:13chuenkitManual testing267268--15.59--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.192 GHz-days
Estimated T-Level:24.464
DigitsB1CurvesCompleteFacMiss
2011000250 / 1002.5008.106%
2550000250 / 2800.89340.883%

New Calculation Method

Total ECM effort:18.192 GHz-days
Estimated T-Level:24.464
DigitsB1CompleteFacMiss
20110009.8210.005%
25500000.91340.116%
302500000.05894.384%
3510000000.00399.730%


ECM Summary

B1B2factorcurvesGHz-days
50000500000018612.92
500006750000141.109
500007500000504.168


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02T00:00:00Ethan O'Connorv4_computersAD1970AE7ECA370C0.104
2015-06-27T00:55:00MadPooManual testingAD1970AE7ECA370C0.104


PRP results:
No PRP results for M1916737


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)
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109
TF factor-bounds graph:
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Last modified: 2022-02-17T11:36:47+00:00