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 A268331 #12 Jun 19 2018 15:11:08
%S A268331 26,170,362,530,638,727,874,926,962,1027,1126,1423,1574,1774,1814,
%T A268331 1826,1861,2059,2402,2526,2674,2726,2782,2874,3178,3482,3574,3719,
%U A268331 3774,3970,4166,4474,4490,4526,4654,5042,5045,5374,5426,5914,5930,6026,6173,6254,6274,6326,6418,6626,6649,6726,7138,7174
%N A268331 Squarefree numbers differing by more than 2 from any other squarefree number.
%H A268331 Christopher E. Thompson, <a href="/A268331/b268331.txt">Table of n, a(n) for n = 1..1000</a>
%e A268331 26 is a term because 26 is squarefree but 24,25,27,28 are not.
%t A268331 SequencePosition[Table[If[SquareFreeQ[n],1,0],{n,7200}],{0,0,1,0,0}][[All,1]]+2 (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Jun 19 2018 *)
%Y A268331 Cf. A073247, A268332, A268333, A268334.
%K A268331 nonn
%O A268331 1,1
%A A268331 _Christopher E. Thompson_, Feb 01 2016