OFFSET
2,1
LINKS
Daniel Suteu, Table of n, a(n) for n = 2..180
FORMULA
MATHEMATICA
Table[Max[FactorInteger[Sum[1/i^2, {i, 1, n}]/Product[1/i^2, {i, 1, n}]]], {n, 2, 30}]
Table[FactorInteger[n!^2*HarmonicNumber[n, 2]][[-1, 1]], {n, 2, 30}] (* Harvey P. Dale, Jul 29 2023 *)
PROG
(PARI) a(n) = vecmax(factor(n!^2 * sum(k=1, n, 1/k^2))[, 1]); \\ Daniel Suteu, Jun 10 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
Alexander Adamchuk, Jul 11 2006
EXTENSIONS
More terms from Daniel Suteu, Jun 10 2022
STATUS
approved