is 2 2137547 - 1
has 643466 decimal digits
takes 0.141 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L4FE9BD241D7569F0double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26955.852268.1159%25000001250000000.87467.2867%56.726970.4392%2.3233%
PrimeNet2580.018062.0690%90001700000.00172.7308%0.019763.1048%1.0358%
GPU722620.287464.5161%100001500000.00171.4872%0.289165.0438%0.5277%
Difference+7+55.5648+3.5998%+2490000+124850000+0.8730+5.7995%+56.4378+5.3954%+5.3954%

Known prime factors:
No known factors for M2137547

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-03-07T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.181%
2010-10-26T05:23:00Oscar Östlin7501175011---0.007--0.577%
2010-11-26T23:33:00Oscar Östlin800001500000---0.015--1.856%
2013-12-03T16:49:00c10ck3rManual testing50000010000000---0.097--3.920%
2017-10-15T15:04:57mikrMSI250000012500000012---0.875--7.287%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-02-07T00:00:00ANONYMOUSv4_computers21258--0.018--
2016-02-23T16:29:06Mark RoseManual testing258260--0.054--
2009-01-05T09:39:00Sturle Sundeeberlin.ifi260261--0.072--
2012-04-15T19:42:00Sebastian HornbostelManual testing261262--0.144--
2013-02-21T00:57:00dbaughManual testing262263--0.459--
2015-03-18T10:56:00VictordeHollanderManual testing263264--0.918--
2015-03-18T10:56:00VictordeHollanderManual testing264265--1.748--
2015-12-27T16:49:14ramgeisManual testing265266--3.496--
2016-10-29T15:24:10Gordon SpenceManual testing266267--6.992--
2019-04-22T13:11:43TJAOIManual testing267268--13.98--
2021-07-19T12:32:39TJAOIManual testing268269--27.97--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.474 GHz-days
Estimated T-Level:23.625
DigitsB1CurvesCompleteFacMiss
2011000203 / 1002.03013.000%
2550000203 / 2800.72548.370%

New Calculation Method

Total ECM effort:17.474 GHz-days
Estimated T-Level:23.625
DigitsB1CompleteFacMiss
20110007.8360.040%
25500000.72648.374%
302500000.04695.513%
3510000000.00299.785%


ECM Summary

B1B2factorcurvesGHz-days
50000500000020217.23
766202417689010.246


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-13T00:00:00ANONYMOUSv4_computers4FE9BD241D7569F00.141
2018-04-07T02:28:18kkmrkkblmbrbkold4FE9BD241D7569F00.141


PRP results:
No PRP results for M2137547


P-1 factor-bounds graph:
B1 = 2500000, B2 = 125000000 (P-1 stage 2)
B1 = 2500000 (P-1 stage 1)
B1 = 500000, B2 = 10000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 80000, B2 = 1500000 (P-1 stage 2)
B1 = 80000 (P-1 stage 1)
B1 = 75011 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-28T10:07:07+00:00