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A093627 a(n) = lcm(1,2,3,...,n) * (sum of Farey fractions of order n). 1
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..25.

Eric Weisstein's World of Mathematics, Farey Sequence..

FORMULA

A093593/A025527 = A093627.

MATHEMATICA

Farey[n_] := Union[ Flatten[ Join[{0}, Table[a/b, {b, n}, {a, b}]]]]; Table[LCM @@ Range[n] Plus @@ Farey[n], {n, 26}]

CROSSREFS

Cf. A093593.

Sequence in context: A069267 A059270 A219085 * A192060 A316642 A146805

Adjacent sequences:  A093624 A093625 A093626 * A093628 A093629 A093630

KEYWORD

nonn

AUTHOR

Robert G. Wilson v and Clark Kimberling, Apr 06 2004

STATUS

approved

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Last modified March 26 00:20 EDT 2019. Contains 321478 sequences. (Running on oeis4.)