is 2 15015967 - 1
has 4520257 decimal digits
takes 7.191 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L30B4290ED616483Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27263.687866.6667%43000090000000.62283.5625%64.310667.8542%1.1875%
PrimeNet2650.485963.0769%6500020000000.11834.1436%0.604264.6069%1.5299%
GPU722697.950765.2174%10000026000000.16402.9938%8.114766.2587%1.0413%
Difference+3+55.7371+1.4493%+330000+6400000+0.4588+0.5687%+56.1959+1.5954%+1.5954%

Known prime factors (1 factor, 81.8 bits, 0.00054445% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1501596740800708385219203866781432581.755135857745242844513
3 × 72 × 101 × 586153 × 15611143
2022-03-035861531561114334,5410.97541.1031

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-03-03T00:00:00ANONYMOUSv4_computers145000688750---0.121--1.570%
2018-01-03T15:04:42riccardo ubertiDuallie-2430000900000012---0.623--3.562%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2022-03-03T20:37:33ATHec2-P_110000002900000027P-12581.7552.094


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-12-31T00:00:00ANONYMOUSv4_computers21265--0.486--
2014-06-11T15:16:00NesowaManual testing265266--0.498--
2014-06-11T15:16:00NesowaManual testing266267--0.995--
2015-11-03T16:50:10mikrManual testing267268--1.991--
2017-09-30T18:03:33ramgeisManual testing268269--3.981--
2020-06-07T14:10:27YxinityManual testing269270--7.962--
2021-09-02T17:55:37SRBaseManual testing270271--15.92--
2021-10-15T18:42:43-Anonymous-Manual testing271272--31.85--


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)
2002-04-28T00:00:00ANONYMOUSv4_computers30B4290ED616483A7.191
2005-09-22T00:00:00Steven Noonanv4_computers30B4290ED616483A7.191


PRP results:
No PRP results for M15015967


P-1 factor-bounds graph:
B1 = 1000000, B2 = 29000000 (P-1 stage 2)
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: 2022-03-03T20:37:33+00:00