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 A106330 #25 Dec 22 2024 17:00:41 %S A106330 5,7,11,25,59,103,245,583,1019,2425,5771,10087,24005,57127,99851, %T A106330 237625,565499,988423,2352245,5597863,9784379,23284825,55413131, %U A106330 96855367,230496005,548533447,958769291,2281675225,5429921339,9490837543,22586256245,53750679943 %N A106330 Numbers k such that k^2 = 24*j^2 + 25. %C A106330 The ratio k(n) /(2*j(n)) tends to sqrt(6) as n increases. %C A106330 k(n) = 2*b + 1, for n > 0, where b is a side of the Heronian triangle (5, b, b+1). - _Andrés Ventas_, Dec 13 2024 %H A106330 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,10,0,0,-1). %F A106330 Recurrence: k(1)=5, k(2)=7, k(3)=11, k(4)=25, k(5)=10*k(2)-k(3), k(6)=10*k(3)-k(2) then k(n)=10*k(n-3)-k(n-6). %F A106330 From _Ralf Stephan_, Nov 15 2010: (Start) %F A106330 G.f.: (-7x^5-11x^4-25x^3+11x^2+7x+5)/(x^6-10x^3+1). %F A106330 a(3n+1) = 5*A001079(n), a(3n+2) = A077409(n), a(3n+3) = A077250(n). (End) %o A106330 (PARI) Vec(-x*(7*x^5+11*x^4+25*x^3-11*x^2-7*x-5)/(x^6-10*x^3+1) + O(x^100)) \\ _Colin Barker_, Apr 16 2014 %Y A106330 Cf. A106331. %K A106330 nonn,easy %O A106330 1,1 %A A106330 _Pierre CAMI_, Apr 29 2005 %E A106330 More terms from _Ralf Stephan_, Nov 15 2010 %E A106330 More terms from _Colin Barker_, Apr 16 2014