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 A146992 #7 Feb 03 2021 01:01:59 %S A146992 96,128,144,162,168,192,216,240,256,270,288,312,320,324,336,360,378, %T A146992 384,400,432,448,450,456,480,486,504,512,528,540,560,576,594,600,624, %U A146992 640,648,672,702,704,720,729,744,750,756,768,784,792,800,810,816,832,840 %N A146992 Numbers n with the property that there exists a group of order n in which some element of the commutator subgroup G' is not a commutator [x,y]. %C A146992 Every multiple of a(n) is also a term of the sequence because the direct product of a group G with any Abelian group A satisfies (GXA)' = G'. %e A146992 a(1) = 96 because there is a group G of order 96 in which an element of G' is not a commutator. %K A146992 hard,nonn %O A146992 1,1 %A A146992 _Bob Heffernan_ and _Des MacHale_, Nov 04 2008