A186324 - OEIS

A186324

Adjusted joint rank sequence of (f(i)) and (g(j)) with f(i) before g(j) when f(i)=g(j), where f and g are the squares and octagonal numbers. Complement of A186325.

1, 3, 5, 6, 8, 9, 11, 12, 14, 16, 17, 19, 20, 22, 23, 25, 27, 28, 30, 31, 33, 35, 36, 38, 39, 41, 42, 44, 46, 47, 49, 50, 52, 53, 55, 57, 58, 60, 61, 63, 65, 66, 68, 69, 71, 72, 74, 76, 77, 79, 80, 82, 83, 85, 87, 88, 90, 91, 93, 94, 96, 98, 99, 101, 102, 104, 106, 107, 109, 110, 112, 113, 115, 117, 118, 120, 121, 123, 124, 126, 128, 129, 131, 132, 134, 135, 137, 139, 140, 142, 143, 145, 147, 148, 150, 151, 153, 154, 156, 158

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

See A186219 for a discussion of adjusted joint rank sequences.

LINKS

Table of n, a(n) for n=1..100.

EXAMPLE

First, write

1..4...9..16....25..36....49..64... (squares)

1....8.......21........40........65. (octagonal)

Replace each number by its rank, where ties are settled by ranking the square number before the octagonal:

a=(1,3,5,6,8,9,11,12,14,...)=A186324

b=(2,4,7,10,13,15,18,21,...)=A186325.

MATHEMATICA

(* adjusted joint ranking; general formula *)

d=1/2; u=1; v=0; w=0; x=3; y=-2; z=0;

h[n_]:=-y+(4x(u*n^2+v*n+w-z-d)+y^2)^(1/2);

a[n_]:=n+Floor[h[n]/(2x)];

k[n_]:=-v+(4u(x*n^2+y*n+z-w+d)+v^2)^(1/2);

b[n_]:=n+Floor[k[n]/(2u)];

Table[a[n], {n, 1, 100}] (* A186324 *)

Table[b[n], {n, 1, 100}] (* A186325 *)

CROSSREFS

Cf. A186219, A186325, A186326, A186327,

A000290 (squares), A000567 (octagonal).

Sequence in context: A336410 A121506 A114119 * A101358 A276210 A186223

Adjacent sequences: A186321 A186322 A186323 * A186325 A186326 A186327

KEYWORD

nonn

AUTHOR

Clark Kimberling, Feb 17 2011

STATUS

approved