A172475 a(n) = floor(n*sqrt(3)/2).

0, 0, 1, 2, 3, 4, 5, 6, 6, 7, 8, 9, 10, 11, 12, 12, 13, 14, 15, 16, 17, 18, 19, 19, 20, 21, 22, 23, 24, 25, 25, 26, 27, 28, 29, 30, 31, 32, 32, 33, 34, 35, 36, 37, 38, 38, 39, 40, 41, 42, 43, 44, 45, 45, 46, 47, 48, 49, 50, 51, 51, 52, 53, 54, 55, 56, 57, 58, 58, 59, 60, 61, 62

Offset: 0

Author

Vincenzo Librandi, Feb 04 2010

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Programs

Magma

[Floor(n*Sqrt(3)/2): n in [0..80]]; // Vincenzo Librandi, Aug 01 2013

Mathematica

With[{c = Sqrt[3]/2}, Floor[c #] &/@ Range[0, 90]]  (* Harvey P. Dale, Feb 07 2011 *)

Formula

a(n) = A171970(n). [R. J. Mathar, Feb 05 2010]