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.
%I A186225 #4 Mar 30 2012 18:57:18 %S A186225 2,3,5,6,8,9,11,13,14,16,17,19,20,22,24,25,27,28,30,32,33,35,36,38,39, %T A186225 41,43,44,46,47,49,50,52,54,55,57,58,60,61,63,65,66,68,69,71,73,74,76, %U A186225 77,79,80,82,84,85,87,88,90,91,93,95,96,98,99,101,102,104,106,107,109,110,112,114,115,117,118,120,121,123,125,126,128,129,131,132,134,136,137,139,140,142,143,145,147,148,150,151,153,155,156,158 %N A186225 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 triangular numbers and pentagonal numbers. Complement of A186226. %e A186225 See A186223. %t A186225 (* Program for adjusted rank sequences as described at A186219 *) %t A186225 d=-1/2; u=1/2; v=1/2; w=0; x=3/2; y=-1/2; z=0; (* triangular & pentagonal *) %t A186225 h[n_]:=-y+(4x(u*n^2+v*n+w-z-d)+y^2)^(1/2); %t A186225 a[n_]:=n+Floor[h[n]/(2x)]; %t A186225 k[n_]:=-v+(4u(x*n^2+y*n+z-w+d)+v^2)^(1/2); %t A186225 b[n_]:=n+Floor[k[n]/(2u)]; %t A186225 Table[a[n],{n,1,100}] (* A186225 *) %t A186225 Table[b[n],{n,1,100}] (* A186226 *) %Y A186225 A186219, A186223, A186224, A186226. %K A186225 nonn %O A186225 1,1 %A A186225 _Clark Kimberling_, Feb 15 2011