A195120 a(n) = 2*n - floor(n*sqrt(3)).

0, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21

Offset

0,5

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..10000

Formula

a(n) = 2*n-A022838(n). - R. J. Mathar, Mar 20 2022

Mathematica

Table[2 n - Floor[n*Sqrt[3]], {n, 0, 100}] (* Wesley Ivan Hurt, May 26 2024 *)

Prog

(Magma) [2*n-Floor(n*Sqrt(3)): n in [0..70]]; // Vincenzo Librandi, Sep 12 2011

Crossrefs

Cf. A022838.

Sequence in context: A129253 A389975 A008652 * A259506 A305817 A091226

Adjacent sequences: A195117 A195118 A195119 * A195121 A195122 A195123

Keyword

nonn

Author

Clark Kimberling, Sep 09 2011

Status

approved