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A120298 Largest prime factor of central factorial number A001819[n]. 0
5, 7, 41, 479, 59, 266681, 63397, 514639, 178939, 242101, 18500393, 40799043101, 190297, 1844659, 78206663, 616798327, 38512247, 86364397717734821, 421950627598601, 84786899, 52030193, 31411862913089, 1422157053067 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..24.

FORMULA

a(n) = Max[FactorInteger[Sum[1/i^2,{i,1,n}]/Product[1/i^2,{i,1,n}]]].

MATHEMATICA

Table[Max[FactorInteger[Sum[1/i^2, {i, 1, n}]/Product[1/i^2, {i, 1, n}]]], {n, 2, 30}]

CROSSREFS

Cf. A001819, A002701.

Sequence in context: A189241 A167205 A123781 * A178342 A117751 A093526

Adjacent sequences:  A120295 A120296 A120297 * A120299 A120300 A120301

KEYWORD

nonn

AUTHOR

Alexander Adamchuk, Jul 11 2006

STATUS

approved

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Last modified April 12 01:36 EDT 2021. Contains 342912 sequences. (Running on oeis4.)