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.

A186541 Adjusted joint rank sequence of (f(i)) and (g(j)) with f(i) after g(j) when f(i)=g(j), where f(i)=i^2 and g(j)=-2+3j^2. Complement of A186542.

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%I A186541 #4 Mar 30 2012 18:57:19
%S A186541 2,3,4,6,8,9,11,12,14,15,17,18,20,22,23,25,26,28,30,31,33,34,36,37,39,
%T A186541 41,42,44,45,47,48,50,52,53,55,56,58,59,61,63,64,66,67,69,70,72,74,75,
%U A186541 77,78,80,82,83,85,86,88,89,91,93,94,96,97,99,100,102,104,105,107,108,110,112,113,115,116,118,119,121,123,124,126,127,129,130,132,134,135,137,138,140,141,143,145,146,148,149,151,153,154,156,157
%N A186541 Adjusted joint rank sequence of (f(i)) and (g(j)) with f(i) after g(j) when f(i)=g(j), where f(i)=i^2 and g(j)=-2+3j^2.  Complement of A186542.
%C A186541 See A186219 for a discussion of adjusted joint rank sequences.
%F A186541 a(n)=n+floor(sqrt((1/3)n^2+5/6))=A186541(n).
%F A186541 b(n)=n+floor(sqrt(3n^2-5/2))=A186542(n).
%e A186541 First, write
%e A186541 1..4..9..16..25..36..49..... (i^2)
%e A186541 .........10.....25.....46.. (-2+3j^2)
%e A186541 Then replace each number by its rank, where ties are settled by ranking i^2 after -2+3j^2:
%e A186541 a=(2,3,4,6,8,9,11,12,14,15,17,18,..)=A186541
%e A186541 b=(1,5,7,10,13,16,19,21,24,27,29...)=A186542.
%t A186541 (* adjusted joint rank sequences a and b, using general formula for ranking ui^2+vi+w and xj^2+yj+z *)
%t A186541 d = -1/2; u = 1; v = 0; w = 0; x = 3; y = 0; z = -2;
%t A186541 h[n_] := -y + (4 x (u*n^2 + v*n + w - z - d) + y^2)^(1/2);
%t A186541 a[n_] := n + Floor[h[n]/(2 x)];
%t A186541 k[n_] := -v + (4 u (x*n^2 + y*n + z - w + d) + v^2)^(1/2);
%t A186541 b[n_] := n + Floor[k[n]/(2 u)];
%t A186541 Table[a[n], {n, 1, 100}]  (* A186539 *)
%t A186541 Table[b[n], {n, 1, 100}]  (* A186540 *)
%Y A186541 Cf. A186219, A186539, A186540, A186542.
%K A186541 nonn
%O A186541 1,1
%A A186541 _Clark Kimberling_, Feb 23 2011