is 2 15049217 - 1
has 4530266 decimal digits
takes 7.207 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LAB507378FC816468double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27263.547166.6667%15000004845580740184.303910.3476%247.851070.1159%3.4492%
PrimeNet2650.484863.0769%6500020000000.11834.1449%0.603164.6073%1.5304%
GPU722697.933165.2174%10000026000000.16402.9948%8.097166.2590%1.0417%
Difference+3+55.6140+1.4493%+1400000+4842980740+184.1399+7.3529%+239.7539+3.8568%+3.8568%

Known prime factors (1 factor, 80.4 bits, 0.00053433% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1504921716092551024287430485612072580.41353466406339570459
17989 × 2972172235231
2022-04-1117989297217223523120,353112,444210,014

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-06-09T00:00:00macwangv4_computers145000688750---0.121--1.570%
2018-02-06T10:59:43riccardo ubertiDuallie-2430000900000012---0.623--3.563%
2022-03-24T21:46:50Luminescence5950X15000004845580740---184.3--10.348%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2022-04-11T11:01:19ATH5960X1000000100000027P+12580.4131.056


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-12-31T00:00:00Net_Forcev4_computers21257--0.001--
2001-01-14T00:00:00ANONYMOUSv4_computers21265--0.485--
2014-06-11T15:21:00NesowaManual testing265266--0.497--
2014-06-11T15:21:00NesowaManual testing266267--0.993--
2016-01-26T18:25:41mikrManual testing267268--1.986--
2017-10-04T12:12:46ramgeisManual testing268269--3.972--
2020-07-10T14:16:31YxinityManual testing269270--7.945--
2021-09-02T18:08:16SRBaseManual testing270271--15.89--
2021-10-15T18:41:11-Anonymous-Manual testing271272--31.78--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.728 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.728 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03296.826%
25500000.00399.709%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.728


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-07-27T00:00:00macwangv4_computersAB507378FC8164687.207
2006-02-15T00:00:00ANONYMOUSv4_computersAB507378FC8164687.207


PRP results:
No PRP results for M15049217


P-1 factor-bounds graph:
B1 = 1500000, B2 = 4845580740 (P-1 stage 2)
B1 = 1500000 (P-1 stage 1)
B1 = 1000000 (P+1 stage 1)
B1 = 430000, B2 = 9000000 (P-1 stage 2)
B1 = 430000 (P-1 stage 1)
B1 = 145000, B2 = 688750 (P-1 stage 2)
B1 = 145000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-04-11T11:01:19+00:00