A195181 a(n) = 6*n - floor(3*n*sqrt(3)).

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

Offset

0,3

Links

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

Formula

a(n) = A195120(3*n). - R. J. Mathar, Sep 11 2011

Maple

A195181:=n->6*n-floor(3*n*sqrt(3)): seq(A195181(n), n=0..150); # Wesley Ivan Hurt, Jan 21 2017

Mathematica

Table[6*n - Floor[3*n*Sqrt[3]], {n, 0, 50}] (* G. C. Greubel, Nov 01 2017 *)

Prog

(Magma) [6*n-Floor(3*n*Sqrt(3)): n in [0..70]]; // Vincenzo Librandi, Sep 12 2011
(PARI) for(n=0, 50, print1(6*n - floor(3*n*sqrt(3)), ", ")) \\ G. C. Greubel, Nov 01 2017

Crossrefs

Cf. A195120.

Sequence in context: A123731 A247973 A352241 * A003005 A332204 A245321

Adjacent sequences: A195178 A195179 A195180 * A195182 A195183 A195184

Keyword

nonn,easy

Author

Clark Kimberling, Sep 10 2011

Status

approved