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A093627
a(n) = lcm(1,2,3,...,n) * (sum of Farey fractions of order n).
0
1, 3, 15, 42, 330, 390, 3990, 9660, 36540, 41580, 595980, 651420, 10630620, 11711700, 13153140, 29189160, 594233640, 630990360, 14083949880, 15015120120, 16411875480, 17575838280, 463140798120, 484557713640, 2690500012200
OFFSET
1,2
LINKS
Eric Weisstein's World of Mathematics, Farey Sequence.
FORMULA
a(n) = A093593(n)/A025527(n).
MATHEMATICA
Farey[n_] := Union[ Flatten[ Join[{0}, Table[a/b, {b, n}, {a, b}]]]]; Table[LCM @@ Range[n] Plus @@ Farey[n], {n, 26}]
CROSSREFS
Sequence in context: A219085 A346142 A366576 * A192060 A316642 A146805
KEYWORD
nonn
AUTHOR
STATUS
approved