is 2 1383583 - 1
has 416500 decimal digits
takes 0.053 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L3E1B3053CEABA678double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26721.476168.6567%500000150000000.07144.9002%21.547570.1926%1.5359%
PrimeNet2560.006962.5000%65001100000.00072.7558%0.007663.5334%1.0334%
GPU722600.111065.0000%5500700000.00051.2005%0.111565.4202%0.4202%
Difference+7+21.3651+3.6567%+494500+14930000+0.0709+3.6998%+21.4360+4.7724%+4.7724%

Known prime factors (1 factor, 76.4 bits, 0.00552220% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1383583999913686041184621762972376.40436134936828552556
22 × 32 × 79 × 149 × 919 × 92788879
2013-09-199199278887912,1530.27990.5227

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00Team Prime Ribv4_computers15000228750---0.001--0.814%
unknown50000015000000---0.071--4.900%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-03T00:00:00ANONYMOUSv4_computers21257--0.014--
2003-07-06T00:00:00ANONYMOUSv4_computers21258--0.028--
2022-03-07T17:32:40LordJuliusManual testing258260--0.083--
2009-04-14T03:14:00Sturle Sundevancraft.ifi260261--0.111--
2012-07-27T07:34:00Grant McCrackenthumper261262--0.222--
2013-01-23T08:21:00dbaughManual testing262263--0.710--


ECM factoring results:

Old Calculation Method

Total ECM effort:25.172 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000298 / 1002.9805.004%
2550000298 / 2801.06434.432%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:25.172 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.5380.000%
25500001.64019.395%
302500000.14086.925%
3510000000.01099.024%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000024811.65
250000350000005013.53


Lucas-Lehmer results:
No L-L results for M1383583


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T12:33:05Oliver KruseGTX-1
99991368604118462176297
C0850EF8C15307__no
2017-10-25T01:00:00kkmrkkblmbrbkold
99991368604118462176297
C0850EF8C15307__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 15000, B2 = 228750 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
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TF factor-bounds graph:
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2100
Last modified: 2022-03-07T17:32:40+00:00