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 A023113 #22 Feb 12 2021 06:04:44 %S A023113 1,25,1849,36481,2666689,52606009,3845364121,75857828929, %T A023113 5545012396225,109386936710041,7995904029992761,157735886878050625, %U A023113 11530088066237165569,227455039491212291641,16626378995609962758169 %N A023113 Squares that remain square when the digit 6 is appended. %C A023113 The terms of the sequence are the squares of the y-values in the solution to the Pellian equation x^2-10*y^2=6. - _Colin Barker_, Sep 28 2013 %F A023113 Empirical g.f.: -x*(x^4+24*x^3+382*x^2+24*x+1) / ((x-1)*(x^2-38*x+1)*(x^2+38*x+1)). - _Colin Barker_, Jan 31 2013 %Y A023113 Cf. A023111, A023112, A023114. %K A023113 nonn,base %O A023113 1,2 %A A023113 _David W. Wilson_ %E A023113 Definition modified by _Harvey P. Dale_, Sep 08 2019