is 2 15091247 - 1
has 4542919 decimal digits
takes 7.569 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L126E5C487BBB63C3double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual273126.751967.1233%28500069112500.46982.8571%127.221768.0626%0.9393%
PrimeNet2650.483463.0769%6500020000000.12394.1466%0.607464.6080%1.5310%
GPU722697.911065.2174%10000026000000.17182.9960%8.082866.2595%1.0421%
Difference+4+118.8409+1.9059%+185000+4311250+0.2980-0.1389%+119.1389+1.8031%-0.1028%

Known prime factors (1 factor, 86.2 bits, 0.00057092% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15091247863558608970771532940127532686.1582861124097202741208
23 × 3 × 139 × 4463 × 17539 × 10956679
2022-08-1117539109566791,521,2580.44620.8108

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-09-02T00:00:00James Heinrichv4_computers850001530000---0.119--1.573%
2004-10-18T00:00:00James Heinrichv4_computers850001530000---0.119--1.573%
2015-05-20T09:57:00Squeeky_SquirrelP4_26002850006911250---0.470--2.857%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2022-08-11T18:07:03ATHec2-P_110000002800000027P-12686.1582.057


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-12-31T00:00:00Net_Forcev4_computers21257--0.001--
2001-03-05T00:00:00delongv4_computers21265--0.483--
2014-06-11T15:25:00NesowaManual testing265266--0.495--
2014-06-11T15:25:00NesowaManual testing266267--0.990--
2016-07-14T20:30:22mikrManual testing267268--1.981--
2017-10-08T22:00:35ramgeisManual testing268269--3.961--
2021-07-06T23:48:13lycornManual testing269270--7.923--
2021-09-02T18:04:46SRBaseManual testing270271--15.85--
2021-10-09T23:37:07-Anonymous-Manual testing271272--31.69--
2022-01-16T18:21:03Architects CubedGPU72_TF272273--63.38--


ECM factoring results:
Total ECM effort:0.763 GHz-days
Estimated T-Level:0.192
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.763


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-09-07T00:00:00ANONYMOUSv4_computers126E5C487BBB63C37.569
2005-09-22T00:00:00Team Prime Ribv4_computers126E5C487BBB63C37.569


PRP results:
No PRP results for M15091247


P-1 factor-bounds graph:
B1 = 1000000, B2 = 28000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 285000, B2 = 6911250 (P-1 stage 2)
B1 = 285000 (P-1 stage 1)
B1 = 85000, B2 = 1530000 (P-1 stage 2)
B1 = 85000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-08-11T18:07:03+00:00