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 A198147 #20 May 09 2021 13:35:06 %S A198147 27,32,54,64,81,96,100,108,125,128,135,147,160,162,189,192,200,216, %T A198147 224,243,250,260,270,273,288,294,297,300,320,324,340,343,351,352,375, %U A198147 378,399,400,405,416,432,441,448,459,480,486,500,507,513,520,540,546,567,580,588 %N A198147 Numbers k for which there are non-isomorphic groups of order k whose core quandles are isomorphic. %C A198147 This is a subsequence of sequence A118642. %H A198147 David Joyce, <a href="http://dx.doi.org/10.1016/0022-4049(82)90077-9">A classifying invariant of knots, the knot quandle</a>, J. Pure Appl. Algebra 23 (1982) 37-65. %H A198147 Wikipedia, <a href="http://en.wikipedia.org/wiki/Quandles">Quandles</a> %K A198147 nonn,hard %O A198147 1,1 %A A198147 _James McCarron_, Dec 21 2012