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A186322 Adjusted joint rank sequence of (f(i)) and (g(j)) with f(i) after g(j) when f(i)=g(j), where f and g are the squares and heptagonal numbers.  Complement of A186323. 4
2, 3, 5, 6, 8, 10, 11, 13, 15, 16, 18, 19, 21, 23, 24, 26, 28, 29, 31, 32, 34, 36, 37, 39, 41, 42, 44, 46, 47, 49, 50, 52, 54, 55, 57, 59, 60, 62, 63, 65, 67, 68, 70, 72, 73, 75, 77, 78, 80, 81, 83, 85, 86, 88, 90, 91, 93, 94, 96, 98, 99, 101, 103, 104, 106, 108, 109, 111, 112, 114, 116, 117, 119, 121, 122, 124, 126, 127, 129, 130, 132, 134, 135, 137, 139, 140, 142, 143, 145, 147, 148, 150, 152, 153, 155, 157, 158, 160, 161, 163 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

EXAMPLE

First, write

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

1....7.......18....34........55.... (heptagonal)

Replace each number by its rank, where ties are settled by ranking the square number after the heptagonal:

a=(2,3,5,6,8,10,11,13,...)=A186322

b=(1,4,7,9,12,15,17,20,...)=A186323.

MATHEMATICA

(* adjusted joint ranking; general formula *)

d=-1/2; u=1; v=0; w=0; x=2; y=-1; 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}]  (* A186322 *)

Table[b[n], {n, 1, 100}]  (* A186323 *)

CROSSREFS

Cf. A186219, A186320, A186321, A186323.

Sequence in context: A026355 A099267 A007067 * A092979 A135260 A248560

Adjacent sequences:  A186319 A186320 A186321 * A186323 A186324 A186325

KEYWORD

nonn

AUTHOR

Clark Kimberling, Feb 17 2011

STATUS

approved

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Last modified October 15 16:14 EDT 2018. Contains 316236 sequences. (Running on oeis4.)