%I #5 Mar 30 2012 18:35:34
%S 1,2,3,4,6,7,8,9,10,11,12,14,15,16,18,19,20,21,22,23,24,27,28,30,31,
%T 32,33,34,36,37,38,40,42,44,45,46,48,49,51,52,53,54,55,56,57,60,62,63,
%U 64,66,68,69,70,72,74,75,76,77,79,80,81,82,84,87,88,90,91,92,93,96,97,98
%N Number of quadratic residues mod n for some n (A000224 sorted and duplicates removed).
%K nonn
%O 1,2
%A _David W. Wilson_