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 A293028 #37 Nov 19 2023 21:17:06
%S A293028 1,5,31,153,745,3779,19011,95121,475251,2375759,11880177,59406541,
%T A293028 297033919,1485165459,7425797777,37129022423
%N A293028 Period of the continued fraction for sqrt(5^(2n+1)).
%F A293028 a(n) = A003285(A013710(n)). - _Michel Marcus_, Sep 25 2019
%t A293028 Table[Length[Last[ContinuedFraction[Sqrt[5^(2n+1)] ]]],{n,0,11}] (* _Metin Sariyar_, Sep 25 2019 *)
%Y A293028 Cf. A003285, A013710, A064932.
%K A293028 nonn,more
%O A293028 0,2
%A A293028 _A.H.M. Smeets_, Sep 28 2017
%E A293028 a(11)-a(13) from _Daniel Suteu_, Jan 24 2019
%E A293028 Better name from _Daniel Suteu_, Jan 24 2019
%E A293028 a(14)-a(15) from _Chai Wah Wu_, Sep 25 2019