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 A020348 #21 Aug 21 2025 08:30:37 %S A020348 31,44,69,71,91,92,108,135,153,158,160,177,188,204,205,206,207,209, %T A020348 234,238,279,282,316,332,348,352,378,383,384,413,414,416,423,432,450, %U A020348 468,476,492,503,539,540,555,585,608,612,638,658,668,684,693,695,696,704,706,707 %N A020348 Numbers k such that the continued fraction for sqrt(k) has period 8. %H A020348 Amiram Eldar, <a href="/A020348/b020348.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..1000 from Vincenzo Librandi) %t A020348 Select[Range[1000], Length[Last[ContinuedFraction[Sqrt[#]]]] == 8 &] (* _Alonso del Arte_, Mar 04 2018 *) %K A020348 nonn,changed %O A020348 1,1 %A A020348 _David W. Wilson_