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 A145212 #24 Jul 13 2016 09:24:47 %S A145212 146,150922981,155479346311338,160173267776326886333, %T A145212 165008898730338715685597026,169990517382847468244368873843701, %U A145212 175122531102470624411936031429357251258,180409480316284222045549532749965177800150413 %N A145212 Numbers x such that there exists n in N : (x+1)^3 - x^3 = 67*n^2. %H A145212 Colin Barker, <a href="/A145212/b145212.txt">Table of n, a(n) for n = 1..150</a> %H A145212 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (1030191,-1030191,1). %F A145212 a(n+2) = 1030190*a(n+1)-a(n)+515094. %F A145212 G.f.: x*(146+515095*x-147*x^2) / ((1-x)*(1-1030190*x+x^2)). - _Colin Barker_, Oct 18 2014, corrected Jul 13 2016 %e A145212 The first relation is : 147^3-146^3=67*31^2. %o A145212 (PARI) Vec(x*(146+515095*x-147*x^2)/((1-x)*(1-1030190*x+x^2)) + O(x^10)) \\ _Colin Barker_, Oct 18 2014, corrected Jul 13 2016 %o A145212 (PARI) isok(x) = issquare(((x+1)^3-x^3)/67) \\ _Colin Barker_, Jul 13 2016 %K A145212 nonn,easy %O A145212 1,1 %A A145212 _Richard Choulet_, Oct 04 2008 %E A145212 Editing and additional term a(8) from _Colin Barker_, Oct 18 2014 %E A145212 a(2) to a(8) corrected by _Colin Barker_, Jul 13 2016