is 2 3639421 - 1
has 1095575 decimal digits
takes 0.382 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L7E92015E2BBD2BBEdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27065.656268.5714%30000000100000000012.617011.1085%78.273272.0627%3.4912%
PrimeNet2600.042263.3333%160003200000.00503.0748%0.047264.4608%1.1274%
GPU722640.978065.6250%220004000000.00652.0352%0.984566.3246%0.6996%
Difference+6+64.6782+2.9464%+29978000+999600000+12.6105+9.0733%+77.2887+5.7381%+5.7381%

Known prime factors:
No known factors for M3639421

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-06T11:20:00Carsten Kossendeyleela20000245000---0.005--0.708%
2012-01-24T11:14:00Squeeky_SquirrelP4_2600900001620000---0.026--1.869%
2016-06-08T14:59:30Jocelyn LaroucheManual testing10800032400006---0.042--2.297%
2016-12-28T01:46:02Jocelyn Larouchelow 4M129600129600---0.020--0.774%
2017-01-30T01:30:50Jocelyn Larouchelow 4M167520167520---0.026--0.897%
2017-02-04T18:43:01Jocelyn Larouchelow 4M201024201024---0.031--0.991%
2017-03-02T20:51:37Jocelyn Larouchelow 4M24122824122806---0.055--2.476%
2020-07-25T02:09:15axnManual testing3000000060000000012---9.298--10.372%
2020-08-19T02:01:38axnManual testing30000000100000000012---12.62--11.108%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-07-07T00:00:00ANONYMOUSv4_computers21260--0.042--
2009-03-11T05:47:00S485122USB-Z260261--0.042--
2011-05-17T04:39:00markroldgamer261262--0.084--
2012-06-20T01:22:00GrunwalderGIMPManual testing21263--0.439--
2016-02-23T16:29:35Mark RoseManual testing262263--0.270--
2015-01-22T10:40:00VictordeHollanderManual testing263264--0.539--
2015-01-22T10:40:00VictordeHollanderManual testing264265--1.027--
2015-10-18T15:17:11ramgeisManual testing265266--2.053--
2016-12-26T04:42:24Gordon SpenceManual testing266267--4.107--
2018-08-06T14:04:58TJAOIManual testing267268--8.213--
2020-11-06T07:02:35axnManual testing268269--16.43--
2022-02-09T09:39:00Gordon SpenceManual testing269270--32.85--


ECM factoring results:

Old Calculation Method

Total ECM effort:7.762 GHz-days
Estimated T-Level:2.500
DigitsB1CurvesCompleteFacMiss
201100050 / 1000.50060.501%
255000050 / 2800.17983.620%

New Calculation Method

Total ECM effort:7.762 GHz-days
Estimated T-Level:2.500
DigitsB1CompleteFacMiss
20110001.96813.974%
25500000.18283.355%
302500000.01298.856%


ECM Summary

B1B2factorcurvesGHz-days
500005000000365.348
50000670000071.202
50000680000071.212


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-08-22T00:00:00ANONYMOUSv4_computers7E92015E2BBD2BBE0.382


PRP results:
No PRP results for M3639421


P-1 factor-bounds graph:
B1 = 30000000, B2 = 1000000000 (P-1 stage 2)
B1 = 30000000, B2 = 600000000 (P-1 stage 2)
B1 = 30000000 (P-1 stage 1)
B1 = 241228, B2 = 2412280 (P-1 stage 2)
B1 = 108000, B2 = 3240000 (P-1 stage 2)
B1 = 241228 (P-1 stage 1)
B1 = 201024 (P-1 stage 1)
B1 = 90000, B2 = 1620000 (P-1 stage 2)
B1 = 167520 (P-1 stage 1)
B1 = 129600 (P-1 stage 1)
B1 = 108000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 20000, B2 = 245000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-06-07T06:29:58+00:00