A195176 a(n) = 3*n - floor(n*sqrt(2)).

0, 2, 4, 5, 7, 8, 10, 12, 13, 15, 16, 18, 20, 21, 23, 24, 26, 27, 29, 31, 32, 34, 35, 37, 39, 40, 42, 43, 45, 46, 48, 50, 51, 53, 54, 56, 58, 59, 61, 62, 64, 66, 67, 69, 70, 72, 73, 75, 77, 78, 80, 81, 83, 85, 86, 88, 89, 91, 92, 94, 96, 97, 99, 100, 102, 104, 105

Offset

0,2

Links

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

Mathematica

With[{c = Sqrt[2]}, Table[3*n - Floor[c*n], {n, 0, 50}]] (* G. C. Greubel, Oct 31 2017 *)

Prog

(Magma) [3*n-Floor(n*(Sqrt(2))): n in [0..70]]; // Vincenzo Librandi, Sep 12 2011
(PARI) a(n) = 3*n - sqrtint(2*n^2) \\ G. C. Greubel, Oct 31 2017

Crossrefs

Cf. A001951.

Sequence in context: A139449 A204399 A020914 * A195126 A047496 A223735

Adjacent sequences: A195173 A195174 A195175 * A195177 A195178 A195179

Keyword

nonn,easy

Author

Clark Kimberling, Sep 10 2011

Status

approved