A032616 a(n) = floor(n^2/Pi).

0, 0, 1, 2, 5, 7, 11, 15, 20, 25, 31, 38, 45, 53, 62, 71, 81, 91, 103, 114, 127, 140, 154, 168, 183, 198, 215, 232, 249, 267, 286, 305, 325, 346, 367, 389, 412, 435, 459, 484, 509, 535, 561, 588, 616, 644, 673, 703, 733, 764, 795, 827, 860, 894

Offset: 0

Author

Patrick De Geest, May 15 1998

Keywords

• nonn
• easy

Crossrefs

Cf. A032615.

Programs

Mathematica

a[n_]:=Floor[(n^2)/Pi]; (* Vladimir Joseph Stephan Orlovsky, Dec 12 2008 *)

PARI

a(n) = n^2\Pi; \\ Michel Marcus, Jan 30 2022

Python

from math import pi
print([int(n**2/pi) for n in range(54)]) # Karl-Heinz Hofmann, Feb 01 2022

Formula

a(n) = A032615(n^2). - Michel Marcus, Jan 30 2022