cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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.

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%I A186324 #6 Mar 30 2012 18:57:18
%S A186324 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,
%T A186324 41,42,44,46,47,49,50,52,53,55,57,58,60,61,63,65,66,68,69,71,72,74,76,
%U A186324 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
%N 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.
%C A186324 See A186219 for a discussion of adjusted joint rank sequences.
%e A186324 First, write
%e A186324 1..4...9..16....25..36....49..64...  (squares)
%e A186324 1....8.......21........40........65. (octagonal)
%e A186324 Replace each number by its rank, where ties are settled by ranking the square number before the octagonal:
%e A186324 a=(1,3,5,6,8,9,11,12,14,...)=A186324
%e A186324 b=(2,4,7,10,13,15,18,21,...)=A186325.
%t A186324 (* adjusted joint ranking; general formula *)
%t A186324 d=1/2; u=1; v=0; w=0; x=3; y=-2; z=0;
%t A186324 h[n_]:=-y+(4x(u*n^2+v*n+w-z-d)+y^2)^(1/2);
%t A186324 a[n_]:=n+Floor[h[n]/(2x)];
%t A186324 k[n_]:=-v+(4u(x*n^2+y*n+z-w+d)+v^2)^(1/2);
%t A186324 b[n_]:=n+Floor[k[n]/(2u)];
%t A186324 Table[a[n], {n, 1, 100}]  (* A186324 *)
%t A186324 Table[b[n], {n, 1, 100}]  (* A186325 *)
%Y A186324 Cf. A186219, A186325, A186326, A186327,
%Y A186324 A000290 (squares), A000567 (octagonal).
%K A186324 nonn
%O A186324 1,2
%A A186324 _Clark Kimberling_, Feb 17 2011