A195129 a(n) = 2*n - floor(n*sqrt(1/3)).

0, 2, 3, 5, 6, 8, 9, 10, 12, 13, 15, 16, 18, 19, 20, 22, 23, 25, 26, 28, 29, 30, 32, 33, 35, 36, 37, 39, 40, 42, 43, 45, 46, 47, 49, 50, 52, 53, 55, 56, 57, 59, 60, 62, 63, 65, 66, 67, 69, 70, 72, 73, 74, 76, 77, 79, 80, 82, 83, 84, 86, 87, 89, 90, 92, 93, 94, 96, 97, 99

Offset: 0

Author

Clark Kimberling, Sep 09 2011

Keywords

• nonn

Links

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

Programs

Magma

[2*n-Floor(n*(Sqrt(1/3))): n in [0..70]]; // Vincenzo Librandi, Sep 12 2011