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 A023114 #24 Jul 21 2024 15:35:09 %S A023114 0,4,16,324,6400,23716,467856,9229444,34199104,674648676,13308852496, %T A023114 49315084900,972842923584,19191356070436,71112318227344, %U A023114 1402838821160100,27673922144716864,102543913568745796,2022892607269941264 %N A023114 Squares that remain square when the digit 9 is appended. %C A023114 The terms of the sequence are the squares of the y-values in the solution to the Pellian equation x^2-10*y^2=9. - _Colin Barker_, Sep 28 2013 %F A023114 Empirical g.f.: -4*x^2*(x+1)*(x^4+2*x^3+75*x^2+2*x+1) / ((x-1)*(x^6-1442*x^3+1)). - _Colin Barker_, Jan 31 2013 %t A023114 Select[Range[0,10^6]^2,IntegerQ[Sqrt[10#+9]]&] (* The program generates the first 13 terms of the sequence. *) (* _Harvey P. Dale_, Jul 21 2024 *) %Y A023114 Cf. A023111, A023112, A023113. %K A023114 nonn,base %O A023114 1,2 %A A023114 _David W. Wilson_