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A218442 a(n) = Sum_{k=0..n} floor(n/(3*k + 1)). 2
0, 1, 2, 3, 5, 6, 7, 9, 11, 12, 14, 15, 17, 19, 21, 22, 25, 26, 27, 29, 32, 34, 36, 37, 39, 41, 43, 44, 48, 49, 51, 53, 56, 57, 59, 61, 63, 65, 67, 69, 73, 74, 76, 78, 81, 82, 84, 85, 88, 91, 94, 95, 99, 100, 101, 103, 107, 109, 111, 112, 115, 117, 119, 121, 125, 127, 129, 131, 134, 135, 139, 140, 142, 144, 146, 148, 152 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Partial sums of A001817.

LINKS

Table of n, a(n) for n=0..76.

PROG

(PARI) a(n)=sum(k=0, n\3, (n\(3*k+1)))

(Maxima) A218442[n]:=sum(floor(n/(3*k+1)), k, 0, n)$

makelist(A218442[n], n, 0, 80); /* Martin Ettl, Oct 29 2012 */

CROSSREFS

Sequence in context: A143664 A282131 A114148 * A255057 A106843 A057165

Adjacent sequences:  A218439 A218440 A218441 * A218443 A218444 A218445

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Oct 28 2012

STATUS

approved

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Last modified November 15 03:37 EST 2018. Contains 317225 sequences. (Running on oeis4.)