A024554 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A024554

a(n) = Sum_{k=1..n} floor( 1/{k*sqrt(5)} ), where {x} := x - floor(x).

4, 6, 7, 8, 13, 15, 16, 17, 25, 27, 28, 29, 43, 46, 47, 48, 124, 128, 130, 131, 132, 137, 139, 140, 141, 148, 150, 151, 152, 164, 167, 168, 169, 207, 210, 212, 213, 214, 218, 220, 221, 222, 228, 230, 231, 232, 242, 245, 246, 247, 272, 275, 276, 277, 278, 282, 284, 285, 286

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Clark Kimberling, Table of n, a(n) for n = 1..1000

MATHEMATICA

Table[Sum[Floor[1/FractionalPart[k*Sqrt[5]]], {k, 1, n}], {n, 1, 100}]

(* Clark Kimberling, Aug 16 2012 *)

PROG

(Magma)a:=Sqrt(5); [&+[Floor(1/(k*a-Floor(k*a))):k in [1..n]]:n in [1..59]]; // Marius A. Burtea, Jul 16 2019

CROSSREFS

Cf. A024555. Partial sums of A024553.