A189388 a(n) = n+[nr/t]+[ns/t]; r=1, s=sqrt(2), t=1/sqrt(3).

4, 9, 15, 19, 25, 30, 36, 40, 46, 51, 56, 61, 66, 72, 76, 82, 87, 93, 97, 102, 108, 113, 118, 123, 129, 134, 139, 144, 150, 154, 159, 165, 170, 175, 180, 186, 191, 196, 201, 206, 212, 216, 222, 227, 232, 237, 243, 248, 253, 258, 263, 269, 273, 279, 284, 289, 294, 300, 305, 309, 315, 320, 326, 330, 336, 341, 347, 351, 357, 362, 366, 372, 377, 383, 387, 393, 398, 404, 408, 413, 419, 424, 429

Offset: 1

Author

Clark Kimberling, Apr 21 2011

Keywords

• nonn

Links

• G. C. Greubel, Table of n, a(n) for n = 1..5000

Crossrefs

Cf. A189386, A189387, A189361, A189383, A189395.

Programs

Mathematica

r=1; s=2^(1/2); t=3^(-1/2);
a[n_] := n + Floor[n*s/r] + Floor[n*t/r];
b[n_] := n + Floor[n*r/s] + Floor[n*t/s];
c[n_] := n + Floor[n*r/t] + Floor[n*s/t]
Table[a[n], {n, 1, 120}]  (*A189386*)
Table[b[n], {n, 1, 120}]  (*A189387*)
Table[c[n], {n, 1, 120}]  (*A189388*)