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A184927 n+[sr/u]+[sn/u]+[tn/u], where []=floor and r=1, s=sqrt(3), t=sqrt(5), u=sqrt(7). 4
1, 4, 7, 10, 13, 16, 18, 22, 24, 27, 31, 33, 35, 39, 41, 45, 48, 50, 54, 56, 58, 62, 65, 68, 71, 73, 76, 79, 81, 85, 88, 91, 93, 96, 99, 102, 105, 108, 110, 114, 116, 119, 123, 125, 129, 131, 133, 137, 140, 142, 146, 148, 151, 154, 157, 160, 163, 165, 168, 171, 174, 177, 180, 183, 185, 188, 191, 194, 198, 200, 203, 206, 208, 211, 215, 217, 221, 223, 225, 229, 232, 234, 238, 239, 243, 246, 248, 252, 255, 258, 260, 263, 266, 269, 272, 275, 277, 281, 283, 286, 290, 292, 295, 298, 300, 304, 307, 309, 313, 315, 317, 321, 323, 327, 330, 332, 335, 338, 340, 344 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The sequences A184924-A184927 partition the positive integers:

  A184924: 6,14,21,28,37,44,52,59,...

  A184925: 3,8,11,17,20,25,30,34,...

  A184926: 2,5,9,12,15,19,23,26,29,...

  A184927: 1,4,7,10,13,16,18,22,24,...

Jointly rank the sets {h*r}, {i*s}, {j*t}, {k*u},

where h>=1, i>=1, j>=1, k>=1.  The position of n*u in the joint ranking is n+[rn/u]+[sn/u]+[tn/u], and likewise for the positions of n*r, n*s, and n*t.

LINKS

Table of n, a(n) for n=1..120.

MATHEMATICA

r=1; s=3^(1/2); t=5^(1/2); u=7^(1/2);

a[n_]:=n+Floor[n*s/r]+Floor[n*t/r]+Floor[n*u/r];

b[n_]:=n+Floor[n*r/s]+Floor[n*t/s]+Floor[n*u/s];

c[n_]:=n+Floor[n*r/t]+Floor[n*s/t]+Floor[n*u/t];

d[n_]:=n+Floor[n*r/u]+Floor[n*s/u]+Floor[n*t/u];

Table[a[n], {n, 1, 120}]  (* A184924 *)

Table[b[n], {n, 1, 120}]  (* A184925 *)

Table[c[n], {n, 1, 120}]  (* A184926 *)

Table[d[n], {n, 1, 120}]  (* A184927 *)

CROSSREFS

Cf. A184924, A184925, A184926.

Sequence in context: A189514 A075990 A244713 * A026314 A070300 A247879

Adjacent sequences:  A184924 A184925 A184926 * A184928 A184929 A184930

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 26 2011

STATUS

approved

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Last modified March 29 15:10 EDT 2017. Contains 284273 sequences.