A172472 a(n) = floor(sqrt(2*n^3)).

0, 1, 4, 7, 11, 15, 20, 26, 32, 38, 44, 51, 58, 66, 74, 82, 90, 99, 108, 117, 126, 136, 145, 155, 166, 176, 187, 198, 209, 220, 232, 244, 256, 268, 280, 292, 305, 318, 331, 344, 357, 371, 384, 398, 412, 426, 441, 455, 470, 485, 500, 515, 530, 545, 561, 576, 592

Offset: 0

Author

Vincenzo Librandi, Feb 04 2010

Keywords

• nonn

Links

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

Programs

Magma

[Floor(Sqrt(2*n^3)): n in [0..60]]; // Vincenzo Librandi, Aug 20 2014

Mathematica

Table[Floor[Sqrt[2 n^3]], {n, 0, 60}] (* Vincenzo Librandi, Aug 20 2014 *)

PARI

vector(100, n, n--; floor(sqrt(2*n^3))) \\ G. C. Greubel, Aug 18 2018