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Search: id:A120299
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| A120299 |
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Largest prime factor of Stirling numbers of first kind s(n,2) A000254[n]. |
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+0
1
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| 3, 11, 5, 137, 7, 11, 761, 7129, 61, 863, 509, 919, 1117, 41233, 8431, 1138979, 39541, 7440427, 11167027, 18858053, 227, 583859, 467183, 312408463, 34395742267, 215087, 375035183, 4990290163, 17783, 2667653736673, 535919, 199539368321
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OFFSET
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2,1
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FORMULA
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a(n) = Max[FactorInteger[Sum[1/i,{i,1,n}]/Product[1/i,{i,1,n}]]].
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MATHEMATICA
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Table[Max[FactorInteger[Sum[1/i, {i, 1, n}]/Product[1/i, {i, 1, n}]]], {n, 2, 40}]
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CROSSREFS
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Cf. A000254, A002547, A001008, A002805.
Sequence in context: A139686 A130537 A114234 this_sequence A094900 A083557 A119324
Adjacent sequences: A120296 A120297 A120298 this_sequence A120300 A120301 A120302
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KEYWORD
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nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Jul 11 2006
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