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 A328801 #14 Oct 30 2019 02:23:40 %S A328801 2,3,3,4,5,4,5,6,5,6,7,7,6,7,8,9,9,7,8,9,10,10,8,9,11,10,11,12,9,10, %T A328801 11,13,12,13,13,10,11,12,14,13,14,15,11,12,13,15,14,16,15,16,12,13,14, %U A328801 17,15,17,16,13,14,17,15,18,16,18,17,19,19,14,15,16,17 %N A328801 Least k such that there exists a square of side length sqrt(A001481(n)) with vertices in a k X k square array of points. %H A328801 Peter Kagey, <a href="/A328801/b328801.txt">Table of n, a(n) for n = 2..10000</a> %F A328801 a(n) = A328803(n) + 1. %e A328801 For n = 8, there is a square with side length sqrt(A001481(8)) = sqrt(10) and vertices in the a(8) X a(8) = 5 X 5 square array of points. %e A328801 o o o * o %e A328801 * o o o o %e A328801 o o o o o %e A328801 o o o o * %e A328801 o * o o o %e A328801 However, there is no square with side length sqrt(10) and vertices in a smaller square array points. %Y A328801 Cf. A001481, A108279. %Y A328801 A328793 is the analog for a triangular grid. %K A328801 nonn,look %O A328801 2,1 %A A328801 _Peter Kagey_, Oct 27 2019