is 2 5553241 - 1
has 1671693 decimal digits
takes 0.877 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L846F62CC4F1F355Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272172.211868.0556%1100000200000000.48774.1549%172.699569.3828%1.3273%
PrimeNet2620.110662.9032%240005500000.01213.1663%0.122764.0778%1.1746%
GPU722662.659465.1515%340007000000.01612.1571%2.675565.9032%0.7517%
Difference+6+169.5524+2.9040%+1066000+19300000+0.4716+1.9978%+170.0239+3.4796%+3.4796%

Known prime factors:
No known factors for M5553241

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2000-08-01T00:00:00ANONYMOUSv4_computers25000275000---0.009--0.638%
2007-11-17T00:00:00Richard B. Woodsv4_computers10250001025000---0.235--1.790%
2017-08-21T16:55:47mognutsStanley15000127500---0.005--0.401%
2018-02-05T01:26:34kkmrkkblmbrbkc4.large11000002000000012---0.488--4.155%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2007-03-04T00:00:00Richard B. Woodsv4_computers21263--0.287--
2007-09-28T00:00:00Richard B. Woodsv4_computers21264--0.641--
2013-10-07T21:51:00lycornManual testing264265--0.673--
2015-09-02T11:00:00snme2pm1Manual testing265266--1.346--
2016-07-27T13:19:56Gordon SpenceManual testing266267--2.691--
2018-07-05T15:04:29ramgeisManual testing267268--5.383--
2020-09-21T11:16:50TJAOIManual testing268269--10.77--
2021-08-18T05:48:35SRBaseManual testing269270--21.53--
2021-09-02T18:00:55SRBaseManual testing270271--43.06--
2021-09-19T18:13:47SRBaseManual testing271272--86.12--


ECM factoring results:

Old Calculation Method

Total ECM effort:2.161 GHz-days
Estimated T-Level:0.450
DigitsB1CurvesCompleteFacMiss
20110009 / 1000.09091.352%
25500009 / 2800.03296.831%

New Calculation Method

Total ECM effort:2.161 GHz-days
Estimated T-Level:0.450
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
50000500000092.161


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-10-22T00:00:00ANONYMOUSv4_computers846F62CC4F1F355A0.877


PRP results:
No PRP results for M5553241


P-1 factor-bounds graph:
B1 = 1100000, B2 = 20000000 (P-1 stage 2)
B1 = 1100000 (P-1 stage 1)
B1 = 1025000 (P-1 stage 1)
B1 = 25000, B2 = 275000 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
B1 = 15000, B2 = 127500 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-09-19T18:13:47+00:00