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 A341249 #10 Oct 09 2022 11:20:24
%S A341249 3,6,13,17,23,27,30,37,40,47,51,54,61,64,71,75,81,85,88,95,99,105,109,
%T A341249 112,119,122,129,133,139,143,146,153,157,163,167,170,177,180,187,191,
%U A341249 194,201,204,211,215,221,225,228,235,238,245,249,252,259,262,269
%N A341249 a(n) = floor(r*floor(s*n)), where r = 2 + sqrt(2) and s = sqrt(2).
%C A341249 Conjecture: 1 < r*s*n - a(n) < 2 for n >= 1.
%t A341249 z = 140; r = 2 + Sqrt[2]; s = Sqrt[2]; f[x_] := Floor[r*Floor[s*x]];
%t A341249 Table[f[n], {n, 1, z}]
%t A341249 Table[Floor[(2+Sqrt[2])Floor[n Sqrt[2]]],{n,60}] (* _Harvey P. Dale_, Oct 09 2022 *)
%Y A341249 Cf. A002193, A341239, A341250.
%K A341249 nonn,easy
%O A341249 1,1
%A A341249 _Clark Kimberling_, Feb 13 2021