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 A067561 #10 Dec 19 2023 23:27:26
%S A067561 1,22,167,334,4821,328663,657326,18796631,37593262,56389893,75186524,
%T A067561 1591338537
%N A067561 Radii n of circles with integer radius that can approximately be squared integrally: the floor or ceiling of Pi*n^2 is an integer square.
%C A067561 a(13) > 5*10^9. - _Sean A. Irvine_, Dec 19 2023
%e A067561 Ceiling(Pi*22^2) = 39^2, so 22 is a term of the sequence.
%t A067561 Do[m = Pi*i^2; r = IntegerQ[Sqrt[Floor[m]]]; s = IntegerQ[Sqrt[Ceiling[m]]]; If[r || s, Print[i]], {i, 1, 10^6}]
%K A067561 nonn,more
%O A067561 1,2
%A A067561 _Joseph L. Pe_, Jan 29 2002
%E A067561 More terms from _Jason Earls_, May 19 2002
%E A067561 a(12) from _Sean A. Irvine_, Dec 19 2023