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A120299 Largest prime factor of Stirling numbers of first kind s(n,2) A000254[n]. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..33.

FORMULA

a(n) = Max[FactorInteger[Sum[1/i,{i,1,n}]/Product[1/i,{i,1,n}]]].

MATHEMATICA

Table[Max[FactorInteger[Sum[1/i, {i, 1, n}]/Product[1/i, {i, 1, n}]]], {n, 2, 40}]

CROSSREFS

Cf. A000254, A002547, A001008, A002805.

Sequence in context: A212402 A114234 A242223 * A094900 A196171 A288902

Adjacent sequences:  A120296 A120297 A120298 * A120300 A120301 A120302

KEYWORD

nonn

AUTHOR

Alexander Adamchuk, Jul 11 2006

STATUS

approved

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Last modified November 24 00:27 EST 2017. Contains 295164 sequences.