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A069627 Sum_{k=1..n} floor(n*(n-1)/(2*k)). 1
0, 0, 1, 5, 12, 22, 35, 53, 74, 101, 129, 162, 202, 244, 292, 344, 403, 463, 527, 601, 676, 762, 844, 937, 1035, 1138, 1245, 1355, 1476, 1597, 1726, 1862, 2002, 2149, 2300, 2454, 2621, 2784, 2957, 3136, 3323, 3515, 3707, 3914, 4119, 4338, 4551, 4782, 5012, 5250 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

The old entry with this sequence number was a duplicate of A072137.

LINKS

Table of n, a(n) for n=0..49.

MAPLE

f:=n->add(floor( n*(n-1)/(2*k) ), k=1..n );

CROSSREFS

Cf. A006218, A118014.

Sequence in context: A022795 A025734 A153818 * A034971 A025740 A225247

Adjacent sequences:  A069624 A069625 A069626 * A069628 A069629 A069630

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 28 2008

STATUS

approved

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Last modified September 20 06:19 EDT 2019. Contains 327212 sequences. (Running on oeis4.)