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 A259183 #39 Aug 18 2015 12:39:29 %S A259183 4,8,9,25,27,32,36,49,64,100,121,125,128,144,169,196,216,225,243,256, %T A259183 289,324,343,361,400,441,484,529,576,676,729,784,841,900,961,1000, %U A259183 1024,1089,1156,1225,1331,1369,1444,1521,1600,1681,1728,1764 %N A259183 Complement of A259444. %H A259183 Charles R Greathouse IV, <a href="/A259183/b259183.txt">Table of n, a(n) for n = 1..10000</a> %F A259183 a(n) ~ n^2. - _Charles R Greathouse IV_, Aug 18 2015 %o A259183 (PARI) main(s)=my(v=vector(s), v2=[], x, r, n); v[1]=2; for(n=2, s, v[n]=v[n-1]+1; until(x==1, for(r=1, n-1, for(s=1, n-1, if((v[r]^v[s])===v[n], v2=concat(v2, v[n]); print1(v[n], ", ");v[n]++; x=0; break(2), x=1))))); v2; %K A259183 nonn %O A259183 1,1 %A A259183 _Anders Hellström_, Jul 19 2015 following suggestion from _N. J. A. Sloane_