is 2 2627057 - 1
has 790823 decimal digits
takes 0.203 GHz-days to do one PRP test
Last-known PrimeNet details:
Assigned as ecm on 2022-07-01, 0.0% done, ETC 2022-07-01
0 primality tests remaining
ResidueStatus
L-L35C705193AE1337Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26945.445168.1159%80000002500000002.37258.9787%47.817670.9787%2.8628%
PrimeNet2590.029262.7119%110002000000.00242.7000%0.031663.7187%1.0068%
GPU722630.607565.0794%130002000000.00261.5721%0.610165.6283%0.5490%
Difference+6+44.8375+3.0366%+7987000+249800000+2.3699+7.4066%+47.2075+5.3504%+5.3504%

Known prime factors:
No known factors for M2627057

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-05-25T00:00:00ANONYMOUSv4_computers35000595000---0.007--1.210%
2011-01-19T23:50:00Jocelyn LaroucheManual testing5000050000---0.006--0.457%
2011-02-27T14:25:00James Heinrichi7-9203000008000000---0.081--3.584%
2018-07-27T10:30:34mikrS063800000025000000012---2.373--8.979%
2018-08-06T19:34:55Jocelyn Larouchelow 4M60000060000006---0.100--3.679%
2019-10-14T15:57:42masserManual testing26300002630000012---0.439--5.703%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-26T00:00:00ANONYMOUSv4_computers21259--0.029--
2000-11-15T00:00:00WillametteMathv4_computers21259--0.029--
2016-02-23T16:29:17Mark RoseManual testing259260--0.029--
2009-02-13T02:51:00Sturle Sundeghibu.ifi260261--0.058--
2012-06-12T06:34:00markroldgamer261262--0.117--
2013-01-23T08:30:00dbaughManual testing262263--0.374--
2015-02-23T17:25:00VictordeHollanderManual testing263264--0.747--
2015-02-23T17:25:00VictordeHollanderManual testing264265--1.422--
2016-01-18T09:58:45ramgeisManual testing265266--2.845--
2017-09-01T23:24:07Gordon SpenceManual testing266267--5.689--
2019-04-01T13:34:42TJAOIManual testing267268--11.38--
2021-06-14T11:23:26TJAOIManual testing268269--22.76--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.754 GHz-days
Estimated T-Level:22.536
DigitsB1CurvesCompleteFacMiss
2011000142 / 1001.42023.999%
2550000142 / 2800.50760.167%

New Calculation Method

Total ECM effort:14.754 GHz-days
Estimated T-Level:22.536
DigitsB1CompleteFacMiss
20110005.4840.415%
25500000.50760.209%
302500000.03296.849%
3510000000.00199.850%


ECM Summary

B1B2factorcurvesGHz-days
50000500000013513.92
50000675000070.830


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-09T00:00:00ANONYMOUSv4_computers35C705193AE1337E0.203
2018-07-09T00:26:26kkmrkkblmbrbkold35C705193AE1337E0.203


PRP results:
No PRP results for M2627057


P-1 factor-bounds graph:
B1 = 8000000, B2 = 250000000 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 2630000, B2 = 26300000 (P-1 stage 2)
B1 = 2630000 (P-1 stage 1)
B1 = 600000, B2 = 6000000 (P-1 stage 2)
B1 = 300000, B2 = 8000000 (P-1 stage 2)
B1 = 600000 (P-1 stage 1)
B1 = 300000 (P-1 stage 1)
B1 = 35000, B2 = 595000 (P-1 stage 2)
B1 = 50000 (P-1 stage 1)
B1 = 35000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-08-08T10:47:04+00:00