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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
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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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LINKS
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Table of n, a(n) for n=2..33.
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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}]
FactorInteger[#][[-1, 1]]&/@StirlingS1[Range[3, 40], 2] (* Harvey P. Dale, May 10 2018 *)
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CROSSREFS
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Cf. A000254, A002547, A001008, A002805.
Sequence in context: A212402 A114234 A242223 * A094900 A196171 A288902
Adjacent sequences: A120296 A120297 A120298 * A120300 A120301 A120302
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KEYWORD
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nonn
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AUTHOR
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Alexander Adamchuk, Jul 11 2006
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STATUS
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approved
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